diff --git a/api/src/main/java/net/luckperms/api/node/types/DisplayNameNode.java b/api/src/main/java/net/luckperms/api/node/types/DisplayNameNode.java
index 4f84be800..36a20b5bb 100644
--- a/api/src/main/java/net/luckperms/api/node/types/DisplayNameNode.java
+++ b/api/src/main/java/net/luckperms/api/node/types/DisplayNameNode.java
@@ -79,6 +79,7 @@ public interface DisplayNameNode extends ScopedNode<DisplayNameNode, DisplayName
          *
          * @param displayName the display name
          * @return the builder
+         * @throws IllegalArgumentException if {@code displayName} is empty
          */
         @NonNull Builder displayName(@NonNull String displayName);
 
diff --git a/api/src/main/java/net/luckperms/api/node/types/InheritanceNode.java b/api/src/main/java/net/luckperms/api/node/types/InheritanceNode.java
index 9a2c74305..36be3f3f2 100644
--- a/api/src/main/java/net/luckperms/api/node/types/InheritanceNode.java
+++ b/api/src/main/java/net/luckperms/api/node/types/InheritanceNode.java
@@ -96,6 +96,7 @@ public interface InheritanceNode extends ScopedNode<InheritanceNode, Inheritance
          *
          * @param group the group name
          * @return the builder
+         * @throws IllegalArgumentException if {@code group} is not a valid group name
          */
         @NonNull Builder group(@NonNull String group);
 
diff --git a/api/src/main/java/net/luckperms/api/node/types/MetaNode.java b/api/src/main/java/net/luckperms/api/node/types/MetaNode.java
index 0def5b34f..502d44fca 100644
--- a/api/src/main/java/net/luckperms/api/node/types/MetaNode.java
+++ b/api/src/main/java/net/luckperms/api/node/types/MetaNode.java
@@ -87,6 +87,7 @@ public interface MetaNode extends ScopedNode<MetaNode, MetaNode.Builder> {
          *
          * @param key the meta key
          * @return the builder
+         * @throws IllegalArgumentException if {@code key} is empty
          */
         @NonNull Builder key(@NonNull String key);
 
diff --git a/api/src/main/java/net/luckperms/api/node/types/PermissionNode.java b/api/src/main/java/net/luckperms/api/node/types/PermissionNode.java
index bcd699de7..d6c852d4b 100644
--- a/api/src/main/java/net/luckperms/api/node/types/PermissionNode.java
+++ b/api/src/main/java/net/luckperms/api/node/types/PermissionNode.java
@@ -104,6 +104,7 @@ public interface PermissionNode extends ScopedNode<PermissionNode, PermissionNod
          *
          * @param permission the permission
          * @return the builder
+         * @throws IllegalArgumentException if {@code permission} is empty
          */
         @NonNull Builder permission(@NonNull String permission);
 
diff --git a/api/src/main/java/net/luckperms/api/node/types/RegexPermissionNode.java b/api/src/main/java/net/luckperms/api/node/types/RegexPermissionNode.java
index f9c1a6899..223f385bc 100644
--- a/api/src/main/java/net/luckperms/api/node/types/RegexPermissionNode.java
+++ b/api/src/main/java/net/luckperms/api/node/types/RegexPermissionNode.java
@@ -101,6 +101,7 @@ public interface RegexPermissionNode extends ScopedNode<RegexPermissionNode, Reg
          *
          * @param pattern the pattern
          * @return the builder
+         * @throws IllegalArgumentException if {@code pattern} is empty
          */
         @NonNull Builder pattern(@NonNull String pattern);
 
diff --git a/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaSet.java b/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaSet.java
index a423dfc6e..4fbc8e3cb 100644
--- a/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaSet.java
+++ b/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaSet.java
@@ -66,6 +66,11 @@ public class MetaSet extends GenericChildCommand {
         String value = args.get(1);
         MutableContextSet context = args.getContextOrDefault(2, plugin);
 
+        if (key.isEmpty()) {
+            Message.INVALID_META_KEY_EMPTY.send(sender);
+            return;
+        }
+
         if (ArgumentPermissions.checkContext(plugin, sender, permission, context) ||
                 ArgumentPermissions.checkGroup(plugin, sender, target, context) ||
                 ArgumentPermissions.checkArguments(plugin, sender, permission, key)) {
diff --git a/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaSetTemp.java b/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaSetTemp.java
index 77b807fe4..877589d16 100644
--- a/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaSetTemp.java
+++ b/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaSetTemp.java
@@ -71,6 +71,11 @@ public class MetaSetTemp extends GenericChildCommand {
         TemporaryNodeMergeStrategy modifier = args.getTemporaryModifierAndRemove(3).orElseGet(() -> plugin.getConfiguration().get(ConfigKeys.TEMPORARY_ADD_BEHAVIOUR));
         MutableContextSet context = args.getContextOrDefault(3, plugin);
 
+        if (key.isEmpty()) {
+            Message.INVALID_META_KEY_EMPTY.send(sender);
+            return;
+        }
+
         if (ArgumentPermissions.checkContext(plugin, sender, permission, context) ||
                 ArgumentPermissions.checkGroup(plugin, sender, target, context) ||
                 ArgumentPermissions.checkArguments(plugin, sender, permission, key)) {
diff --git a/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaUnset.java b/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaUnset.java
index 67269172b..797f59319 100644
--- a/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaUnset.java
+++ b/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaUnset.java
@@ -62,6 +62,11 @@ public class MetaUnset extends GenericChildCommand {
         String key = args.get(0);
         MutableContextSet context = args.getContextOrDefault(1, plugin);
 
+        if (key.isEmpty()) {
+            Message.INVALID_META_KEY_EMPTY.send(sender);
+            return;
+        }
+
         if (ArgumentPermissions.checkContext(plugin, sender, permission, context) ||
                 ArgumentPermissions.checkGroup(plugin, sender, target, context) ||
                 ArgumentPermissions.checkArguments(plugin, sender, permission, key)) {
diff --git a/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaUnsetTemp.java b/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaUnsetTemp.java
index e7050c801..48a165938 100644
--- a/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaUnsetTemp.java
+++ b/common/src/main/java/me/lucko/luckperms/common/commands/generic/meta/MetaUnsetTemp.java
@@ -62,6 +62,11 @@ public class MetaUnsetTemp extends GenericChildCommand {
         String key = args.get(0);
         MutableContextSet context = args.getContextOrDefault(1, plugin);
 
+        if (key.isEmpty()) {
+            Message.INVALID_META_KEY_EMPTY.send(sender);
+            return;
+        }
+
         if (ArgumentPermissions.checkContext(plugin, sender, permission, context) ||
                 ArgumentPermissions.checkGroup(plugin, sender, target, context) ||
                 ArgumentPermissions.checkArguments(plugin, sender, permission, key)) {
diff --git a/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionCheck.java b/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionCheck.java
index 679f93d4d..f341c3f35 100644
--- a/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionCheck.java
+++ b/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionCheck.java
@@ -72,6 +72,10 @@ public class PermissionCheck extends GenericChildCommand {
         }
 
         String node = args.get(0);
+        if (node.isEmpty()) {
+            Message.INVALID_PERMISSION_EMPTY.send(sender);
+            return;
+        }
 
         // accumulate nodes
         List<Node> own = new ArrayList<>();
diff --git a/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionSet.java b/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionSet.java
index 7ec065ed9..c629408d4 100644
--- a/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionSet.java
+++ b/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionSet.java
@@ -67,7 +67,8 @@ public class PermissionSet extends GenericChildCommand {
         MutableContextSet context = args.getContextOrDefault(2, plugin);
 
         if (node.isEmpty()) {
-            Message.PERMISSION_INVALID_ENTRY_EMPTY.send(sender);
+            Message.INVALID_PERMISSION_EMPTY.send(sender);
+            return;
         }
 
         if (ArgumentPermissions.checkContext(plugin, sender, permission, context) ||
diff --git a/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionSetTemp.java b/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionSetTemp.java
index 36ac9785c..5b59d2a68 100644
--- a/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionSetTemp.java
+++ b/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionSetTemp.java
@@ -72,7 +72,8 @@ public class PermissionSetTemp extends GenericChildCommand {
         MutableContextSet context = args.getContextOrDefault(3, plugin);
 
         if (node.isEmpty()) {
-            Message.PERMISSION_INVALID_ENTRY_EMPTY.send(sender);
+            Message.INVALID_PERMISSION_EMPTY.send(sender);
+            return;
         }
 
         if (ArgumentPermissions.checkContext(plugin, sender, permission, context) ||
diff --git a/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionUnset.java b/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionUnset.java
index 544d29e71..ed2f2e25b 100644
--- a/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionUnset.java
+++ b/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionUnset.java
@@ -66,7 +66,8 @@ public class PermissionUnset extends GenericChildCommand {
         MutableContextSet context = args.getContextOrDefault(1, plugin);
 
         if (node.isEmpty()) {
-            Message.PERMISSION_INVALID_ENTRY_EMPTY.send(sender);
+            Message.INVALID_PERMISSION_EMPTY.send(sender);
+            return;
         }
 
         if (ArgumentPermissions.checkContext(plugin, sender, permission, context) ||
diff --git a/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionUnsetTemp.java b/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionUnsetTemp.java
index 2ba38edce..cfc8e9fe0 100644
--- a/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionUnsetTemp.java
+++ b/common/src/main/java/me/lucko/luckperms/common/commands/generic/permission/PermissionUnsetTemp.java
@@ -69,7 +69,8 @@ public class PermissionUnsetTemp extends GenericChildCommand {
         MutableContextSet context = args.getContextOrDefault(fromIndex, plugin);
 
         if (node.isEmpty()) {
-            Message.PERMISSION_INVALID_ENTRY_EMPTY.send(sender);
+            Message.INVALID_PERMISSION_EMPTY.send(sender);
+            return;
         }
 
         if (ArgumentPermissions.checkContext(plugin, sender, permission, context) ||
diff --git a/common/src/main/java/me/lucko/luckperms/common/commands/group/DeleteGroup.java b/common/src/main/java/me/lucko/luckperms/common/commands/group/DeleteGroup.java
index 57794664e..29e5ee9d4 100644
--- a/common/src/main/java/me/lucko/luckperms/common/commands/group/DeleteGroup.java
+++ b/common/src/main/java/me/lucko/luckperms/common/commands/group/DeleteGroup.java
@@ -50,6 +50,7 @@ import me.lucko.luckperms.common.model.manager.group.GroupManager;
 import me.lucko.luckperms.common.node.types.Inheritance;
 import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 import me.lucko.luckperms.common.sender.Sender;
+import me.lucko.luckperms.common.storage.misc.DataConstraints;
 import me.lucko.luckperms.common.util.Predicates;
 
 import net.luckperms.api.actionlog.Action;
@@ -72,6 +73,10 @@ public class DeleteGroup extends SingleCommand {
         }
 
         String groupName = args.get(0).toLowerCase(Locale.ROOT);
+        if (!DataConstraints.GROUP_NAME_TEST.test(groupName)) {
+            Message.GROUP_INVALID_ENTRY.send(sender, groupName);
+            return;
+        }
 
         if (groupName.equalsIgnoreCase(GroupManager.DEFAULT_GROUP_NAME)) {
             Message.DELETE_GROUP_ERROR_DEFAULT.send(sender);
diff --git a/common/src/main/java/me/lucko/luckperms/common/commands/group/GroupSetDisplayName.java b/common/src/main/java/me/lucko/luckperms/common/commands/group/GroupSetDisplayName.java
index fe00b961b..9326fa7a4 100644
--- a/common/src/main/java/me/lucko/luckperms/common/commands/group/GroupSetDisplayName.java
+++ b/common/src/main/java/me/lucko/luckperms/common/commands/group/GroupSetDisplayName.java
@@ -64,6 +64,11 @@ public class GroupSetDisplayName extends ChildCommand<Group> {
         String name = args.get(0);
         ImmutableContextSet context = args.getContextOrDefault(1, plugin).immutableCopy();
 
+        if (name.isEmpty()) {
+            Message.INVALID_DISPLAY_NAME_EMPTY.send(sender);
+            return;
+        }
+
         String previousName = target.normalData().nodesInContext(context).stream()
                 .filter(NodeType.DISPLAY_NAME::matches)
                 .map(NodeType.DISPLAY_NAME::cast)
diff --git a/common/src/main/java/me/lucko/luckperms/common/locale/Message.java b/common/src/main/java/me/lucko/luckperms/common/locale/Message.java
index 0be4e97e1..34eed5df7 100644
--- a/common/src/main/java/me/lucko/luckperms/common/locale/Message.java
+++ b/common/src/main/java/me/lucko/luckperms/common/locale/Message.java
@@ -2200,13 +2200,18 @@ public interface Message {
             .append(FULL_STOP)
     );
 
-    Args0 PERMISSION_INVALID_ENTRY_EMPTY = () -> prefixed(translatable()
-            // "&cThe empty string is not a valid permission."
-            .key("luckperms.command.misc.permission-invalid-empty")
+    Args1<String> INVALID_INPUT_EMPTY = s -> prefixed(translatable()
+            // "&cThe empty string is not a valid {s}."
+            .key("luckperms.command.misc.invalid-input-empty-" + s)
             .color(RED)
             .append(FULL_STOP)
     );
 
+    // Predefined shorthands for the above message
+    Args0 INVALID_PERMISSION_EMPTY = () -> INVALID_INPUT_EMPTY.build("permission");
+    Args0 INVALID_META_KEY_EMPTY = () -> INVALID_INPUT_EMPTY.build("meta-key");
+    Args0 INVALID_DISPLAY_NAME_EMPTY = () -> INVALID_INPUT_EMPTY.build("display-name");
+
     Args3<PermissionHolder, Group, ContextSet> SET_INHERIT_SUCCESS = (holder, parent, context) -> prefixed(translatable()
             // "&b{}&a now inherits permissions from &b{}&a in context {}&a."
             .key("luckperms.command.generic.parent.add")
diff --git a/common/src/main/java/me/lucko/luckperms/common/node/types/DisplayName.java b/common/src/main/java/me/lucko/luckperms/common/node/types/DisplayName.java
index d09b026f6..b61d8de5b 100644
--- a/common/src/main/java/me/lucko/luckperms/common/node/types/DisplayName.java
+++ b/common/src/main/java/me/lucko/luckperms/common/node/types/DisplayName.java
@@ -95,7 +95,11 @@ public class DisplayName extends AbstractNode<DisplayNameNode, DisplayNameNode.B
 
         @Override
         public @NonNull Builder displayName(@NonNull String displayName) {
-            this.displayName = Objects.requireNonNull(displayName, "displayName");
+            Objects.requireNonNull(displayName, "displayName");
+            if (displayName.isEmpty()) {
+                throw new IllegalArgumentException("display name is empty");
+            }
+            this.displayName = displayName;
             return this;
         }
 
diff --git a/common/src/main/java/me/lucko/luckperms/common/node/types/Inheritance.java b/common/src/main/java/me/lucko/luckperms/common/node/types/Inheritance.java
index 0fbf36087..0dc6f47da 100644
--- a/common/src/main/java/me/lucko/luckperms/common/node/types/Inheritance.java
+++ b/common/src/main/java/me/lucko/luckperms/common/node/types/Inheritance.java
@@ -28,6 +28,7 @@ package me.lucko.luckperms.common.node.types;
 import me.lucko.luckperms.common.node.AbstractNode;
 import me.lucko.luckperms.common.node.AbstractNodeBuilder;
 
+import me.lucko.luckperms.common.storage.misc.DataConstraints;
 import net.luckperms.api.context.ImmutableContextSet;
 import net.luckperms.api.model.group.Group;
 import net.luckperms.api.node.metadata.NodeMetadataKey;
@@ -97,7 +98,11 @@ public class Inheritance extends AbstractNode<InheritanceNode, InheritanceNode.B
 
         @Override
         public @NonNull Builder group(@NonNull String group) {
-            this.groupName = Objects.requireNonNull(group, "group");
+            Objects.requireNonNull(group, "group");
+            if (!DataConstraints.GROUP_NAME_TEST.test(group)) {
+                throw new IllegalArgumentException("group name is invalid");
+            }
+            this.groupName = group;
             return this;
         }
 
diff --git a/common/src/main/resources/luckperms_en.properties b/common/src/main/resources/luckperms_en.properties
index a0fb7cd47..8703a62ef 100644
--- a/common/src/main/resources/luckperms_en.properties
+++ b/common/src/main/resources/luckperms_en.properties
@@ -62,7 +62,9 @@ luckperms.command.misc.webapp-unable-to-communicate=Unable to communicate with t
 luckperms.command.misc.check-console-for-errors=Check the console for errors
 luckperms.command.misc.file-must-be-in-data=File {0} must be a direct child of the data directory
 luckperms.command.misc.wait-to-finish=Please wait for it to finish and try again
-luckperms.command.misc.permission-invalid-empty=The empty string is not a valid permission
+luckperms.command.misc.invalid-input-empty-permission=The empty string is not a valid permission
+luckperms.command.misc.invalid-input-empty-meta-key=The empty string is not a valid meta key
+luckperms.command.misc.invalid-input-empty-display-name=The empty string is not a valid display name
 luckperms.command.misc.invalid-priority=Invalid priority {0}
 luckperms.command.misc.expected-number=Expected a number
 luckperms.command.misc.date-parse-error=Could not parse date {0}
diff --git a/common/src/test/java/me/lucko/luckperms/common/node/NodeParseTest.java b/common/src/test/java/me/lucko/luckperms/common/node/NodeParseTest.java
index 2590535c3..5f154818b 100644
--- a/common/src/test/java/me/lucko/luckperms/common/node/NodeParseTest.java
+++ b/common/src/test/java/me/lucko/luckperms/common/node/NodeParseTest.java
@@ -48,7 +48,6 @@ public class NodeParseTest {
     @CsvSource({
             "group.test, test",
             "group.TEST, test",
-            "group.hello world, hello world"
     })
     public void testInheritance(String key, String expectedGroupName) {
         Inheritance.Builder builder = Inheritance.parse(key);
@@ -68,6 +67,14 @@ public class NodeParseTest {
         assertNull(builder);
     }
 
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "group.hello world"
+    })
+    public void testInheritanceThrows(String key) {
+        assertThrows(IllegalArgumentException.class, () -> Inheritance.parse(key));
+    }
+
     @ParameterizedTest
     @CsvSource({
             "displayname.test, test",
@@ -92,6 +99,14 @@ public class NodeParseTest {
         assertNull(builder);
     }
 
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "displayname."
+    })
+    public void testDisplayNameThrows(String key) {
+        assertThrows(IllegalArgumentException.class, () -> DisplayName.parse(key));
+    }
+
     @ParameterizedTest
     @CsvSource({
             "weight.100, 100",