Check the mod, not it's container, in the check handler. Closes #358

src/main/java/cpw/mods/fml/common/network/internal/NetworkModHolder.java

@@ -58,7 +58,7 @@ public class NetworkModHolder
         {
             try
             {
-                return (Boolean) checkHandler.invoke(container, remoteVersions, side);
+                return (Boolean) checkHandler.invoke(container.getMod(), remoteVersions, side);
             }
             catch (Exception e)
             {