src/macosx/classes/sun/awt/CGraphicsDevice.java

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@@ -192,10 +192,13 @@
         return true;
     }
 
     @Override
     public void setDisplayMode(DisplayMode dm) {
+        if (dm == null) {
+            throw new IllegalArgumentException("Attempt to set null as a DisplayMode");
+        }
         nativeSetDisplayMode(displayID, dm.getWidth(), dm.getHeight(), dm.getBitDepth(), dm.getRefreshRate());
         if (isFullScreenSupported() && getFullScreenWindow() != null) {
             getFullScreenWindow().setSize(dm.getWidth(), dm.getHeight());
         }
     }