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

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java.lang.NullPointerException:
at com.mbeddr.mpsutil.breadcrumb.runtime.plugin.AbstractNavigationPanel$4.accept(AbstractNavigationPanel.java:255)
at com.mbeddr.mpsutil.breadcrumb.runtime.plugin.AbstractNavigationPanel$4.accept(AbstractNavigationPanel.java:1)
at jetbrains.mps.internal.collections.runtime.IWhereFilter.invoke(IWhereFilter.java:12)
at jetbrains.mps.internal.collections.runtime.impl.FilteringSequence$FilteringIterator.moveToNext(FilteringSequence.java:63)
at jetbrains.mps.internal.collections.runtime.impl.FilteringSequence$FilteringIterator.hasNext(FilteringSequence.java:34)
at jetbrains.mps.internal.collections.runtime.IterableUtils.first(IterableUtils.java:59)
at jetbrains.mps.internal.collections.runtime.AbstractSequence.first(AbstractSequence.java:187)
at com.mbeddr.mpsutil.breadcrumb.runtime.plugin.AbstractNavigationPanel.getMpsFileNodeEditor(AbstractNavigationPanel.java:252)
at com.mbeddr.mpsutil.breadcrumb.runtime.plugin.AbstractNavigationPanel.removeFromEditor(AbstractNavigationPanel.java:225)
at com.mbeddr.mpsutil.breadcrumb.runtime.plugin.AbstractNavigationPanel.dispose(AbstractNavigationPanel.java:109)
at com.mbeddr.mpsutil.breadcrumb.runtime.plugin.BreadcrumbPanel.dispose(BreadcrumbPanel.java:152)
at com.mbeddr.mpsutil.breadcrumb.runtime.plugin.AbstractNavigationPanel$2.editorWillBeDisposed(AbstractNavigationPanel.java:190)
at jetbrains.mps.nodeEditor.EditorComponent.fireEditorWillBeDisposed(EditorComponent.java:1963)
at jetbrains.mps.nodeEditor.EditorComponent.dispose(EditorComponent.java:1515)
at jetbrains.mps.nodeEditor.NodeEditorComponent.dispose(NodeEditorComponent.java:133)
at jetbrains.mps.ide.editor.BaseNodeEditor.dispose(BaseNodeEditor.java:134)
at com.intellij.openapi.util.Disposer$1.execute(Disposer.java:46)
at com.intellij.openapi.util.Disposer$1.execute(Disposer.java:43)
at com.intellij.openapi.util.objectTree.ObjectTree.executeActionWithRecursiveGuard(ObjectTree.java:146)
at com.intellij.openapi.util.objectTree.ObjectTree.executeUnregistered(ObjectTree.java:158)
at com.intellij.openapi.util.objectTree.ObjectTree.executeAll(ObjectTree.java:125)
at com.intellij.openapi.util.Disposer.dispose(Disposer.java:107)
at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.disposeComposite(FileEditorManagerImpl.java:1677)
at com.intellij.openapi.fileEditor.impl.EditorWindow$3.run(EditorWindow.java:244)
at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.runChange(FileEditorManagerImpl.java:1707)
at com.intellij.openapi.fileEditor.impl.EditorWindow.closeFile(EditorWindow.java:221)
at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl$7.run(FileEditorManagerImpl.java:612)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:124)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:99)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:85)

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