Suppress firing events at load time if an error has already occurred (#4801)

src/main/java/net/minecraftforge/client/model/ModelLoader.java

@@ -952,6 +952,8 @@ public final class ModelLoader extends ModelBakery
      */
     public void onPostBakeEvent(IRegistry<ModelResourceLocation, IBakedModel> modelRegistry)
     {
+        if (!isLoading) return;
+
         IBakedModel missingModel = modelRegistry.getObject(MODEL_MISSING);
         Map<String, Integer> modelErrors = Maps.newHashMap();
         Set<ResourceLocation> printedBlockStateErrors = Sets.newHashSet();

src/main/java/net/minecraftforge/fml/common/LoadController.java

@@ -28,6 +28,7 @@ import java.util.Map;
 import java.util.Map.Entry;
 import java.util.stream.Collectors;
 
+import net.minecraftforge.common.MinecraftForge;
 import net.minecraftforge.common.util.TextTable;
 import net.minecraftforge.fml.common.LoaderState.ModState;
 import net.minecraftforge.fml.common.ProgressManager.ProgressBar;
@@ -185,6 +186,7 @@ public class LoadController
         if (errors.size() > 0)
         {
             FMLLog.log.fatal("Fatal errors were detected during {}. Loading cannot continue.", state);
+            MinecraftForge.EVENT_BUS.shutdown();
             state = state.transition(true);
             throw throwStoredErrors();
         }

src/main/java/net/minecraftforge/fml/common/eventhandler/EventBus.java

@@ -47,6 +47,7 @@ public class EventBus implements IEventExceptionHandler
     private Map<Object,ModContainer> listenerOwners = new MapMaker().weakKeys().weakValues().makeMap();
     private final int busID = maxID++;
     private IEventExceptionHandler exceptionHandler;
+    private boolean shutdown;
 
     public EventBus()
     {
@@ -170,6 +171,8 @@ public class EventBus implements IEventExceptionHandler
 
     public boolean post(Event event)
     {
+        if (shutdown) return false;
+
         IEventListener[] listeners = event.getListenerList().getListeners(busID);
         int index = 0;
         try
@@ -185,7 +188,13 @@ public class EventBus implements IEventExceptionHandler
             Throwables.throwIfUnchecked(throwable);
             throw new RuntimeException(throwable);
         }
-        return (event.isCancelable() ? event.isCanceled() : false);
+        return event.isCancelable() && event.isCanceled();
+    }
+
+    public void shutdown()
+    {
+        FMLLog.log.warn("EventBus {} shutting down - future events will not be posted.", busID);
+        shutdown = true;
     }
 
     @Override