SimpleColoredComponent Exception

I get this in JSP's for IJ 8823. The blame idea core is disabled.

Argument 0 for @NotNull parameter of com/intellij/ui/SimpleColoredComponent.append must not be null
java.lang.IllegalArgumentException: Argument 0 for @NotNull parameter of com/intellij/ui/SimpleColoredComponent.append must not be null
at com.intellij.ui.SimpleColoredComponent.append(SimpleColoredComponent.java)
at com.intellij.ide.navigationToolbar.NavBarPanel$MyCompositeLabel.]]>(NavBarPanel.java:31)
at com.intellij.ide.navigationToolbar.NavBarPanel.a(NavBarPanel.java:152)
at com.intellij.ide.navigationToolbar.NavBarPanel.access$2500(NavBarPanel.java:129)
at com.intellij.ide.navigationToolbar.NavBarPanel$26.run(NavBarPanel.java:4)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:1)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:145)
at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:212)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:101)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

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