java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.zaproxy.zap.extension.zest.ExtensionZest.unload(Unknown Source)
at org.zaproxy.zap.control.AddOnInstaller.uninstallAddOnExtension(Unknown Source)
at org.zaproxy.zap.control.AddOnInstaller.uninstallAddOnExtensions(Unknown Source)
at org.zaproxy.zap.control.AddOnInstaller.uninstall(Unknown Source)
at org.zaproxy.zap.control.AddOnLoader.removeAddOnImpl(Unknown Source)
at org.zaproxy.zap.control.AddOnLoader.removeAddOn(Unknown Source)
at org.zaproxy.zap.extension.autoupdate.ExtensionAutoUpdate.uninstall(Unknown Source)
at org.zaproxy.zap.extension.autoupdate.ExtensionAutoUpdate.access$1100(Unknown Source)
at org.zaproxy.zap.extension.autoupdate.ExtensionAutoUpdate$10.doInBackground(Unknown Source)
at org.zaproxy.zap.extension.autoupdate.ExtensionAutoUpdate$10.doInBackground(Unknown Source)
at javax.swing.SwingWorker$1.call(SwingWorker.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at javax.swing.SwingWorker.run(SwingWorker.java:334)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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