src/macosx/native/sun/awt/CWrapper.m

*** 44,56 ****
--- 44,58 ----
  (JNIEnv *env, jclass cls, jlong objectPtr)
  {
  JNF_COCOA_ENTER(env);
  
      id obj = (id)jlong_to_ptr(objectPtr);
+     if (obj != nil) {
          [JNFRunLoop performOnMainThreadWaiting:NO withBlock:^(){
              CFRelease(obj);
          }];
+     }
  
  JNF_COCOA_EXIT(env);
  }