IDEA-172571 IntelliJ IDEA won't start on Mac OS Sierra

platform/util/src/com/intellij/util/ui/JBUI.java

@@ -184,7 +184,7 @@ public class JBUI {
       try {
         gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
       } catch (HeadlessException ignore) {}
-      if (gd != null) {
+      if (gd != null && gd.getDefaultConfiguration() != null) {
         return sysScale(gd.getDefaultConfiguration());
       }
       return 1.0f;