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Build: NetBeans IDE 8.2 (Build 201609300101) VM: Java HotSpot(TM) 64-Bit Server VM, 25.111-b14, Java(TM) SE Runtime Environment, 1.8.0_111-b14 OS: Linux User Comments: GUEST: I had Java projects open, files open in the editor, heirarchy frame open. I was not actively doing anything at the time of the error. I ran java with -ea and -esa . ondrejd: I created custom plugin which opens tab with embedded web browser. Stacktrace: java.lang.AssertionError: *** pgAccessCount underflow at javafx.scene.Scene.impl_setAllowPGAccess(Scene.java:467) at javafx.scene.web.WebView.handleStagePulse(WebView.java:1003) at javafx.scene.web.WebView.lambda$new$29(WebView.java:280) at com.sun.javafx.tk.Toolkit.lambda$runPulse$30(Toolkit.java:355) at java.security.AccessController.doPrivileged(AccessController.java:0) at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:354)
Created attachment 163803 [details] stacktrace