java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
at java.util.HashMap$KeyIterator.next(HashMap.java:1461)
at com.vladsch.idea.multimarkdown.highlighter.MultiMarkdownHighlighterColors.migrateAttributes(MultiMarkdownHighlighterColors.java:212)
at com.vladsch.idea.multimarkdown.MultiMarkdownPlugin.initComponent(MultiMarkdownPlugin.kt:133)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:518)
at com.intellij.openapi.components.impl.ComponentManagerImpl.createComponents(ComponentManagerImpl.java:119)
at com.intellij.openapi.application.impl.ApplicationImpl.a(ApplicationImpl.java:429)
at com.intellij.openapi.progress.impl.CoreProgressManager$3.run(CoreProgressManager.java:170)
at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:494)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:443)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:155)
at com.intellij.openapi.application.impl.ApplicationImpl.createComponents(ApplicationImpl.java:436)
at com.intellij.openapi.components.impl.ComponentManagerImpl.init(ComponentManagerImpl.java:103)
at com.intellij.openapi.application.impl.ApplicationImpl.load(ApplicationImpl.java:392)
at com.intellij.openapi.application.impl.ApplicationImpl.load(ApplicationImpl.java:384)
at com.intellij.idea.IdeaApplication.run(IdeaApplication.java:193)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.idea.MainImpl$1$1.a(MainImpl.java:62)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
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:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
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)

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