Supress protocol conversion errors

SpigotCore_Main/src/de/steamwar/core/ErrorHandler.java

@@ -149,6 +149,7 @@ public class ErrorHandler extends Handler {
         startsWith.add("Chunk coordinates: ");
         startsWith.add("Failed to save history");
         startsWith.add("\t... ");
+        startsWith.add("ERROR IN Protocol");
         ignoreStartsWith = Collections.unmodifiableList(startsWith);
 
         List<String> contains = new ArrayList<>();