Reproducible: always
Regression: no
Platform-specific: yes, macos/java7 only.
Product: JDK7u111b13 (64bit)
Platform: Mac10.12-Beta x64 (or Mac10.11)
Steps to reproduce:
1. Open http://oracle.com in WebView
Expected result: Site clearly visible
Actual result: Site displayed correctly, but exception is thrown

Bug is reporodcuible only on http://www.oracle.com and doesn't affect user so P4.

Error log:
016-08-17 17:27:49.770 java[2881:87554] [JRSAppKitAWT markAppIsDaemon]: Process manager already initialized: can't fully enable headless mode.
runOnRT called from AWT-AppKit
java.lang.Exception: Stack trace
at java.lang.Thread.dumpStack(Thread.java:1365)
at com.sun.webpane.sg.prism.InvokerImpl.runOnRenderThread(InvokerImpl.java:57)
at com.sun.webpane.sg.prism.RTImage.getPixelBuffer(RTImage.java:97)
at com.sun.webpane.sg.prism.RTImage.getImage(RTImage.java:33)
at com.sun.webpane.sg.prism.PrismImage.toDataURL(PrismImage.java:41)
at com.sun.webpane.webkit.Timer.twkFireTimerEvent(Native Method)
at com.sun.webpane.webkit.Timer.fireTimerEvent(Timer.java:66)
at com.sun.webpane.webkit.Timer.notifyTick(Timer.java:47)
at javafx.scene.web.WebEngine$PulseTimer$2.pulse(WebEngine.java:915)
at com.sun.javafx.tk.Toolkit$5.run(Toolkit.java:370)
at com.sun.javafx.tk.Toolkit$5.run(Toolkit.java:368)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:368)
at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:391)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:463)
at com.sun.javafx.tk.quantum.QuantumToolkit$9.run(QuantumToolkit.java:332)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:76)