diff --git a/bukkit/src/main/java/me/lucko/luckperms/BukkitSenderFactory.java b/bukkit/src/main/java/me/lucko/luckperms/BukkitSenderFactory.java
index 219f1ed46..a5c8a6785 100644
--- a/bukkit/src/main/java/me/lucko/luckperms/BukkitSenderFactory.java
+++ b/bukkit/src/main/java/me/lucko/luckperms/BukkitSenderFactory.java
@@ -34,8 +34,8 @@ import java.util.UUID;
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public class BukkitSenderFactory extends SenderFactory<CommandSender> {
     private static BukkitSenderFactory instance = null;
-    public static BukkitSenderFactory get() {
-        if (instance == null){
+    public static synchronized BukkitSenderFactory get() {
+        if (instance == null) {
             instance = new BukkitSenderFactory();
         }
         return instance;
diff --git a/bungee/src/main/java/me/lucko/luckperms/BungeeSenderFactory.java b/bungee/src/main/java/me/lucko/luckperms/BungeeSenderFactory.java
index 8c04aba83..10a865607 100644
--- a/bungee/src/main/java/me/lucko/luckperms/BungeeSenderFactory.java
+++ b/bungee/src/main/java/me/lucko/luckperms/BungeeSenderFactory.java
@@ -35,8 +35,8 @@ import java.util.UUID;
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public class BungeeSenderFactory extends SenderFactory<CommandSender> {
     private static BungeeSenderFactory instance = null;
-    public static BungeeSenderFactory get() {
-        if (instance == null){
+    public static synchronized BungeeSenderFactory get() {
+        if (instance == null) {
             instance = new BungeeSenderFactory();
         }
         return instance;
diff --git a/sponge/src/main/java/me/lucko/luckperms/SpongeSenderFactory.java b/sponge/src/main/java/me/lucko/luckperms/SpongeSenderFactory.java
index 2bf7dccd2..d02ed84cf 100644
--- a/sponge/src/main/java/me/lucko/luckperms/SpongeSenderFactory.java
+++ b/sponge/src/main/java/me/lucko/luckperms/SpongeSenderFactory.java
@@ -35,8 +35,8 @@ import java.util.UUID;
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public class SpongeSenderFactory extends SenderFactory<CommandSource> {
     private static SpongeSenderFactory instance = null;
-    public static SpongeSenderFactory get() {
-        if (instance == null){
+    public static synchronized SpongeSenderFactory get() {
+        if (instance == null) {
             instance = new SpongeSenderFactory();
         }
         return instance;