MATLAB: Merge tool java error

gitmerge toolsimulinksource control

I'm using Matlab 2020a in Windows 10. I've followed the setup instructions for git in the link. Comparison window of two simulink models works fine, but when I switch to merge mode following error lines appears in the command window, and all the button icons and texts are replaced by the text "disposed". I can choose one of the conflicting changes in merge mode too, but there is no "save" or "finish merge" or a similar button. I've also attached the screenshot. Did I forget to install or configure anything?
Exception in thread "AWT-EventQueue-0": java.lang.NullPointerException
	at java.awt.Container.addImpl(Container.java:1095)
	at java.awt.Container.add(Container.java:419)
	at com.mathworks.toolstrip.factory.TSFactory.createGroup(TSFactory.java:1296)
	at com.mathworks.toolstrip.factory.TSFactory.createComponent(TSFactory.java:780)
	at com.mathworks.toolstrip.factory.TSFactory.createTab(TSFactory.java:271)
	at com.mathworks.toolstrip.factory.TSFactory.createTab(TSFactory.java:208)
	at com.mathworks.toolstrip.factory.TSFactory.createTab(TSFactory.java:200)
	at com.mathworks.comparisons.report.toolstrip.ComparisonToolstripTabConfiguration.createTab(ComparisonToolstripTabConfiguration.java:77)
	at com.mathworks.comparisons.report.toolstrip.ComparisonToolstripConfiguration.createTabs(ComparisonToolstripConfiguration.java:42)
	at com.mathworks.comparisons.gui.report.ComparisonReport.updateToolstrip(ComparisonReport.java:328)
	at com.mathworks.comparisons.gui.report.ComparisonReport.access$400(ComparisonReport.java:62)
	at com.mathworks.comparisons.gui.report.ComparisonReport$3$1.run(ComparisonReport.java:216)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

Best Answer

I have been contacted by MATLAB technical support service. They confirmed that this is a known issue in 2019b and 2020a and suggested me to move to 2020b.
FYI.
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