diff -r 18e7ed2cd7d1 -r 3020baa4efa4 src/java.desktop/macosx/native/libawt_lwawt/awt/AWTView.m
--- a/src/java.desktop/macosx/native/libawt_lwawt/awt/AWTView.m	Wed Sep 04 10:12:42 2019 +0200
+++ b/src/java.desktop/macosx/native/libawt_lwawt/awt/AWTView.m	Sat Sep 07 11:38:36 2019 -0700
@@ -1408,10 +1408,8 @@
     JNF_COCOA_ENTER(env);
 
     NSView *view = (NSView *)jlong_to_ptr(viewPtr);
-    NSWindow *window = [view window];
-
     [ThreadUtilities performOnMainThreadWaiting:YES block:^(){
-
+        NSWindow *window = [view window];
         ret = (jint)[[AWTWindow getNSWindowDisplayID_AppKitThread: window] intValue];
     }];