modules/graphics/src/main/native-glass/mac/GlassWindow+Overrides.m

@@ -112,12 +112,15 @@
         NSWindow *child = (NSWindow*)[children objectAtIndex:i];
         [child close];
     }
     
     // Call the notification method
-    GET_MAIN_JENV;
+    assert(pthread_main_np() == 1);
+    JNIEnv *env = jEnv;
+    if (env != NULL) {
     (*env)->CallVoidMethod(env, self->jWindow, jWindowNotifyDestroy);
+    }
 }
 
 - (void)windowWillMove:(NSNotification *)notification
 {
     //NSLog(@"windowWillMove");