diff --git a/src/main/java/de/erethon/dungeonsxl/sign/BedSign.java b/src/main/java/de/erethon/dungeonsxl/sign/BedSign.java
index 47ed2b1f..68ab3a5f 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/BedSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/BedSign.java
@@ -61,7 +61,7 @@ public class BedSign extends DSign {
             }
             getSign().getBlock().setType(VanillaItem.AIR.getMaterial());
         } else {
-            markAsErroneous();
+            markAsErroneous("No bed attached");
         }
     }
 
diff --git a/src/main/java/de/erethon/dungeonsxl/sign/BlockSign.java b/src/main/java/de/erethon/dungeonsxl/sign/BlockSign.java
index 0543f8ee..f665f16a 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/BlockSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/BlockSign.java
@@ -48,20 +48,30 @@ public class BlockSign extends DSign {
 
     @Override
     public void onInit() {
-        if (!lines[1].isEmpty()) {
-            String line1[] = lines[1].split(",");
-            offBlock = plugin.getCaliburn().getExItem(line1[0]);
-            if (line1.length > 1) {
-                offBlockData = (byte) NumberUtil.parseInt(line1[1]);
-            }
+        if (lines[1].isEmpty()) {
+            offBlock = VanillaItem.AIR;
+        } else if (lines[2].isEmpty()) {
+            onBlock = VanillaItem.AIR;
         }
 
-        if (!lines[2].isEmpty()) {
-            String line2[] = lines[2].split(",");
-            onBlock = plugin.getCaliburn().getExItem(line2[0]);
-            if (line2.length > 1) {
-                onBlockData = (byte) NumberUtil.parseInt(line2[1]);
-            }
+        String[] line1 = lines[1].split(",");
+        offBlock = plugin.getCaliburn().getExItem(line1[0]);
+        if (offBlock == null) {
+            markAsErroneous("Could not recognize offBlock, input: " + lines[1]);
+            return;
+        }
+        if (line1.length > 1) {
+            offBlockData = (byte) NumberUtil.parseInt(line1[1]);
+        }
+
+        String[] line2 = lines[2].split(",");
+        onBlock = plugin.getCaliburn().getExItem(line2[0]);
+        if (onBlock == null) {
+            markAsErroneous("Could not recognize onBlock, input: " + lines[2]);
+            return;
+        }
+        if (line2.length > 1) {
+            onBlockData = (byte) NumberUtil.parseInt(line2[1]);
         }
 
         getSign().getBlock().setType(offBlock.getMaterial());
diff --git a/src/main/java/de/erethon/dungeonsxl/sign/BossShopSign.java b/src/main/java/de/erethon/dungeonsxl/sign/BossShopSign.java
index 038c78c3..404a02c6 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/BossShopSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/BossShopSign.java
@@ -67,8 +67,11 @@ public class BossShopSign extends DSign {
 
     @Override
     public void onInit() {
-        if (bossShop == null || bossShop.getAPI().getShop(lines[1]) == null) {
-            markAsErroneous();
+        if (bossShop == null) {
+            markAsErroneous("BossShop not enabled");
+            return;
+        } else if (bossShop.getAPI().getShop(lines[1]) == null) {
+            markAsErroneous("No such BossShop");
             return;
         }
 
diff --git a/src/main/java/de/erethon/dungeonsxl/sign/ChestSign.java b/src/main/java/de/erethon/dungeonsxl/sign/ChestSign.java
index 8c81cb99..c98f4db5 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/ChestSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/ChestSign.java
@@ -186,7 +186,7 @@ public class ChestSign extends DSign {
             getSign().getBlock().setType(VanillaItem.AIR.getMaterial());
 
         } else {
-            markAsErroneous();
+            markAsErroneous("No chest attached");
         }
     }
 
diff --git a/src/main/java/de/erethon/dungeonsxl/sign/DSign.java b/src/main/java/de/erethon/dungeonsxl/sign/DSign.java
index 376c343c..1aa67341 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/DSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/DSign.java
@@ -53,6 +53,8 @@ public abstract class DSign {
     // List of Triggers
     private Set<Trigger> triggers = new HashSet<>();
 
+    private boolean erroneous;
+
     public DSign(Sign sign, String[] lines, DGameWorld gameWorld) {
         this.sign = sign;
         this.lines = lines;
@@ -168,6 +170,10 @@ public abstract class DSign {
     }
 
     public void onUpdate() {
+        if (erroneous) {
+            return;
+        }
+
         for (Trigger trigger : triggers) {
             if (!trigger.isTriggered()) {
                 onDisable();
@@ -197,17 +203,26 @@ public abstract class DSign {
         return !triggers.isEmpty();
     }
 
+    public boolean isErroneous() {
+        return erroneous;
+    }
+
     /**
      * Set a placeholder to show that the sign is setup incorrectly.
+     *
+     * @param reason
+     * the reason why the sign is marked as erroneous
      */
-    public void markAsErroneous() {
+    public void markAsErroneous(String reason) {
+        erroneous = true;
         sign.setLine(0, ERROR_0);
         sign.setLine(1, ERROR_1);
         sign.setLine(2, ERROR_2);
         sign.setLine(3, ERROR_3);
         sign.update();
 
-        DMessage.LOG_ERROR_SIGN_SETUP.getMessage(sign.getX() + ", " + sign.getY() + ", " + sign.getZ());
+        MessageUtil.log(plugin, DMessage.LOG_ERROR_SIGN_SETUP.getMessage(sign.getX() + ", " + sign.getY() + ", " + sign.getZ()));
+        MessageUtil.log(plugin, getType().getName() + ": " + reason);
     }
 
     /* Statics */
diff --git a/src/main/java/de/erethon/dungeonsxl/sign/OpenDoorSign.java b/src/main/java/de/erethon/dungeonsxl/sign/OpenDoorSign.java
index f090316a..c1263cba 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/OpenDoorSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/OpenDoorSign.java
@@ -95,7 +95,7 @@ public class OpenDoorSign extends DSign {
             getSign().getBlock().setType(VanillaItem.AIR.getMaterial());
 
         } else {
-            markAsErroneous();
+            markAsErroneous("No door attached");
         }
     }
 
diff --git a/src/main/java/de/erethon/dungeonsxl/sign/ResourcePackSign.java b/src/main/java/de/erethon/dungeonsxl/sign/ResourcePackSign.java
index d88c6c2f..bdbb576c 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/ResourcePackSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/ResourcePackSign.java
@@ -78,7 +78,7 @@ public class ResourcePackSign extends DSign {
             resourcePack = (String) url;
 
         } else {
-            markAsErroneous();
+            markAsErroneous("Unknown resourcepack format");
             return;
         }
 
diff --git a/src/main/java/de/erethon/dungeonsxl/sign/ScriptSign.java b/src/main/java/de/erethon/dungeonsxl/sign/ScriptSign.java
index 52ba0ff4..65efdcf5 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/ScriptSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/ScriptSign.java
@@ -51,6 +51,9 @@ public class ScriptSign extends DSign {
         SignScript script = plugin.getSignScripts().getByName(name);
         for (String[] lines : script.getSigns()) {
             DSign dSign = DSign.create(getSign(), lines, getGameWorld());
+            if (dSign.isErroneous()) {
+                continue;
+            }
             getGameWorld().getDSigns().add(dSign);
 
             dSign.onInit();
diff --git a/src/main/java/de/erethon/dungeonsxl/sign/lobby/ClassesSign.java b/src/main/java/de/erethon/dungeonsxl/sign/lobby/ClassesSign.java
index bd5917b9..2ca64680 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/lobby/ClassesSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/lobby/ClassesSign.java
@@ -71,7 +71,7 @@ public class ClassesSign extends DSign {
             getGameWorld().getClassesSigns().add(getSign());
 
         } else {
-            markAsErroneous();
+            markAsErroneous("No such class");
         }
     }
 
diff --git a/src/main/java/de/erethon/dungeonsxl/sign/message/HologramSign.java b/src/main/java/de/erethon/dungeonsxl/sign/message/HologramSign.java
index aef18e99..6daec383 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/message/HologramSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/message/HologramSign.java
@@ -52,7 +52,7 @@ public class HologramSign extends DSign {
     @Override
     public void onInit() {
         if (Bukkit.getPluginManager().getPlugin("HolographicDisplays") == null) {
-            markAsErroneous();
+            markAsErroneous("HolographicDisplays not enabled");
             return;
         }
         getSign().getBlock().setType(VanillaItem.AIR.getMaterial());
diff --git a/src/main/java/de/erethon/dungeonsxl/sign/message/SoundMessageSign.java b/src/main/java/de/erethon/dungeonsxl/sign/message/SoundMessageSign.java
index 7ad87713..fb6f6ef9 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/message/SoundMessageSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/message/SoundMessageSign.java
@@ -81,7 +81,7 @@ public class SoundMessageSign extends DSign {
             getSign().getBlock().setType(VanillaItem.AIR.getMaterial());
             initialized = true;
         } else {
-            markAsErroneous();
+            markAsErroneous("1. Line is empty; expected input: sound name");
         }
     }
 
diff --git a/src/main/java/de/erethon/dungeonsxl/sign/mob/ExternalMobSign.java b/src/main/java/de/erethon/dungeonsxl/sign/mob/ExternalMobSign.java
index b34f4bf7..bab91af0 100644
--- a/src/main/java/de/erethon/dungeonsxl/sign/mob/ExternalMobSign.java
+++ b/src/main/java/de/erethon/dungeonsxl/sign/mob/ExternalMobSign.java
@@ -233,7 +233,7 @@ public class ExternalMobSign extends DSign implements MobSign {
                 }
 
                 if (provider == null) {
-                    markAsErroneous();
+                    markAsErroneous("Could not fetch a known external mob provider from " + lines[2]);
                     return;
                 }
             }
diff --git a/src/main/java/de/erethon/dungeonsxl/world/DGameWorld.java b/src/main/java/de/erethon/dungeonsxl/world/DGameWorld.java
index 9f576c28..ff6d455c 100644
--- a/src/main/java/de/erethon/dungeonsxl/world/DGameWorld.java
+++ b/src/main/java/de/erethon/dungeonsxl/world/DGameWorld.java
@@ -31,7 +31,6 @@ import de.erethon.dungeonsxl.mob.DMob;
 import de.erethon.dungeonsxl.player.DGroup;
 import de.erethon.dungeonsxl.sign.DSign;
 import de.erethon.dungeonsxl.sign.DSignType;
-import de.erethon.dungeonsxl.sign.DSignTypeDefault;
 import de.erethon.dungeonsxl.sign.LocationSign;
 import de.erethon.dungeonsxl.sign.lobby.StartSign;
 import de.erethon.dungeonsxl.sign.mob.MobSign;
@@ -174,7 +173,7 @@ public class DGameWorld extends DInstanceWorld {
 
         // Try the matching location
         for (DSign dSign : dSigns) {
-            if (dSign.getType() == DSignTypeDefault.START) {
+            if (dSign instanceof StartSign) {
                 if (((StartSign) dSign).getId() == index) {
                     return ((LocationSign) dSign).getLocation();
                 }
@@ -183,7 +182,7 @@ public class DGameWorld extends DInstanceWorld {
 
         // Try any location
         for (DSign dSign : dSigns) {
-            if (dSign.getType() == DSignTypeDefault.START) {
+            if (dSign instanceof StartSign) {
                 return ((LocationSign) dSign).getLocation();
             }
         }
@@ -479,10 +478,8 @@ public class DGameWorld extends DInstanceWorld {
         }
 
         for (DSign dSign : dSigns) {
-            if (dSign != null) {
-                if (!dSign.hasTriggers()) {
-                    dSign.onTrigger();
-                }
+            if (dSign != null && !dSign.isErroneous() && !dSign.hasTriggers()) {
+                dSign.onTrigger();
             }
         }
     }