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Diagram Generation Fails with NullPointerException #20

@syoon2

Description

@syoon2
java.lang.NullPointerException
        at visual.composite.ImageDisplay.autofitImage(ImageDisplay.java:357)
        at ui.Display.showImage(Display.java:217)
        at ui.Display$1.clickEvent(Display.java:141)
        at input.NestedEventReceiver.clickEvent(NestedEventReceiver.java:103)
        at visual.panel.ElementPanel.clickEvent(ElementPanel.java:476)
        at visual.panel.ElementPanel.clickReleaseEvent(ElementPanel.java:483)
        at input.manager.actionevent.MouseActionEvent.execute(MouseActionEvent.java:46)
        at input.manager.TimedThread.run(TimedThread.java:58)
Fail forward exception: ActionEventManager's TimedThread object produced an exception while executing input.

(Possibly related) Upstream issue: https://gitlab.com/graphviz/graphviz/-/issues/352

Workaround: https://gitlab.com/graphviz/graphviz/-/issues/1408#note_226047328

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