diff --git a/core/src/main/java/de/erethon/dungeonsxl/sign/button/ActionBarSign.java b/core/src/main/java/de/erethon/dungeonsxl/sign/button/ActionBarSign.java
index 38f4fbd2..ac3b8e92 100644
--- a/core/src/main/java/de/erethon/dungeonsxl/sign/button/ActionBarSign.java
+++ b/core/src/main/java/de/erethon/dungeonsxl/sign/button/ActionBarSign.java
@@ -43,9 +43,8 @@ public class ActionBarSign extends MessageSign {
     }
 
     @Override
-    public boolean push(Player player) {
+    public void sendMessage(Player player) {
         MessageUtil.sendActionBarMessage(player, text);
-        return true;
     }
 
 }
diff --git a/core/src/main/java/de/erethon/dungeonsxl/sign/button/ChatMessageSign.java b/core/src/main/java/de/erethon/dungeonsxl/sign/button/ChatMessageSign.java
index b47caeda..6666671d 100644
--- a/core/src/main/java/de/erethon/dungeonsxl/sign/button/ChatMessageSign.java
+++ b/core/src/main/java/de/erethon/dungeonsxl/sign/button/ChatMessageSign.java
@@ -20,8 +20,6 @@ import de.erethon.commons.chat.MessageUtil;
 import de.erethon.dungeonsxl.api.DungeonsAPI;
 import de.erethon.dungeonsxl.api.world.InstanceWorld;
 import de.erethon.dungeonsxl.player.DPermission;
-import java.util.ArrayList;
-import java.util.List;
 import org.bukkit.block.Sign;
 import org.bukkit.entity.Player;
 
@@ -30,8 +28,6 @@ import org.bukkit.entity.Player;
  */
 public class ChatMessageSign extends MessageSign {
 
-    private List<Player> done = new ArrayList<>();
-
     public ChatMessageSign(DungeonsAPI api, Sign sign, String[] lines, InstanceWorld instance) {
         super(api, sign, lines, instance);
     }
@@ -47,25 +43,8 @@ public class ChatMessageSign extends MessageSign {
     }
 
     @Override
-    public boolean push(Player player) {
-        if (!done.contains(player)) {
-            MessageUtil.sendMessage(player, text);
-            done.add(player);
-        }
-
-        if (done.size() >= getGameWorld().getWorld().getPlayers().size()) {
-            getGameWorld().removeDungeonSign(this);
-        }
-
-        return true;
-    }
-
-    @Override
-    public void push() {
-        for (Player player : getGameWorld().getWorld().getPlayers()) {
-            MessageUtil.sendMessage(player, text);
-        }
-        getGameWorld().removeDungeonSign(this);
+    public void sendMessage(Player player) {
+        MessageUtil.sendMessage(player, text);
     }
 
 }
diff --git a/core/src/main/java/de/erethon/dungeonsxl/sign/button/MessageSign.java b/core/src/main/java/de/erethon/dungeonsxl/sign/button/MessageSign.java
index a8e13669..3d3c2e71 100644
--- a/core/src/main/java/de/erethon/dungeonsxl/sign/button/MessageSign.java
+++ b/core/src/main/java/de/erethon/dungeonsxl/sign/button/MessageSign.java
@@ -21,14 +21,18 @@ import de.erethon.dungeonsxl.api.DungeonsAPI;
 import de.erethon.dungeonsxl.api.dungeon.GameRule;
 import de.erethon.dungeonsxl.api.sign.Button;
 import de.erethon.dungeonsxl.api.world.InstanceWorld;
+import java.util.ArrayList;
+import java.util.List;
 import org.bukkit.block.Sign;
+import org.bukkit.entity.Player;
 
 /**
  * @author Daniel Saukel
  */
 public abstract class MessageSign extends Button {
 
-    protected String text;
+    protected String text = "UNKNOWN MESSAGE";
+    private List<Player> done = new ArrayList<>();
 
     public MessageSign(DungeonsAPI api, Sign sign, String[] lines, InstanceWorld instance) {
         super(api, sign, lines, instance);
@@ -67,7 +71,33 @@ public abstract class MessageSign extends Button {
         String text = getGameWorld().getDungeon().getRules().getState(GameRule.MESSAGES).get(NumberUtil.parseInt(getLine(1)));
         if (text != null) {
             this.text = text;
+        } else {
+            markAsErroneous("Unknown message, ID: " + getLine(1));
         }
     }
 
+    @Override
+    public boolean push(Player player) {
+        if (!done.contains(player)) {
+            sendMessage(player);
+            done.add(player);
+        }
+
+        if (done.size() >= getGameWorld().getWorld().getPlayers().size()) {
+            getGameWorld().removeDungeonSign(this);
+        }
+
+        return true;
+    }
+
+    @Override
+    public void push() {
+        for (Player player : getGameWorld().getWorld().getPlayers()) {
+            sendMessage(player);
+        }
+        getGameWorld().removeDungeonSign(this);
+    }
+
+    public abstract void sendMessage(Player player);
+
 }
diff --git a/core/src/main/java/de/erethon/dungeonsxl/sign/button/TitleSign.java b/core/src/main/java/de/erethon/dungeonsxl/sign/button/TitleSign.java
index 66496b77..0ee4cca1 100644
--- a/core/src/main/java/de/erethon/dungeonsxl/sign/button/TitleSign.java
+++ b/core/src/main/java/de/erethon/dungeonsxl/sign/button/TitleSign.java
@@ -55,11 +55,16 @@ public class TitleSign extends MessageSign {
         int id0 = NumberUtil.parseInt(line1[0], -1);
         title = messages.get(id0);
         if (title == null) {
-            title = "";
+            markAsErroneous("Unknown message, ID: " + getLine(1));
+            return;
         }
         if (line1.length > 1) {
             int id1 = NumberUtil.parseInt(line1[1], -1);
             subtitle = messages.get(id1);
+            if (subtitle == null) {
+                markAsErroneous("Unknown message, ID: " + getLine(1));
+                return;
+            }
         }
         if (subtitle == null) {
             subtitle = "";
@@ -78,9 +83,8 @@ public class TitleSign extends MessageSign {
     }
 
     @Override
-    public boolean push(Player player) {
+    public void sendMessage(Player player) {
         MessageUtil.sendTitleMessage(player, title, subtitle, fadeIn, stay, fadeOut);
-        return true;
     }
 
 }