Index: src/video/quartz/SDL_QuartzWM.m
===================================================================
--- src/video/quartz/SDL_QuartzWM.m	(revision 3449)
+++ src/video/quartz/SDL_QuartzWM.m	(working copy)
@@ -355,6 +355,10 @@
 
     if ( ! [ qz_window isMiniaturized ] ) {
         [ qz_window miniaturize:nil ];
+        if ( ! [ qz_window isMiniaturized ] ) {
+            SDL_SetError ("miniaturize failed");
+            return 0;
+        }
         return 1;
     }
     else {