diff --git a/src/com/massivecraft/massivecore/mixin/MessageMixinDefault.java b/src/com/massivecraft/massivecore/mixin/MessageMixinDefault.java
index 7630c991..e22db854 100644
--- a/src/com/massivecraft/massivecore/mixin/MessageMixinDefault.java
+++ b/src/com/massivecraft/massivecore/mixin/MessageMixinDefault.java
@@ -111,7 +111,8 @@ public class MessageMixinDefault extends MessageMixinAbstract
 		}
 		else
 		{
-			throw new IllegalArgumentException("The messages must be either String or Mson.");
+			String desc = first == null ? "null" : first.getClass().getSimpleName();
+			throw new IllegalArgumentException(desc + " is neither String nor Mson.");
 		}
 	}