NullPointerException

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Unexpected exception received while running Sketch It!: java.lang.NullPointerException
Please, do not hesitate to report it:
 * by mail at philippe.mesmeur@gmail.com
 * by opening an issue at https://bitbucket.org/pmesmeur/sketch.it/issues

For an efficient investigation, please do not forget to provide:
 * the call stack that follows the current message
 * the IDEA log file (to find it, select entry "Show Log in Explorer", from "Help" menu)

Sorry for inconvenience and thank you for your contribution.

Call stack:
org.pmesmeur.sketchit.diagram.UmlModuleClassDiagram.getClassDiagramOutputStream(UmlModuleClassDiagram.java:37)
org.pmesmeur.sketchit.diagram.UmlModuleClassDiagram.getOutputFile(UmlModuleClassDiagram.java:31)
org.pmesmeur.sketchit.diagram.UmlDiagram.generate(UmlDiagram.java:32)
org.pmesmeur.sketchit.diagram.UmlDiagramsGenerator.generateModuleClassDiagram(UmlDiagramsGenerator.java:44)
org.pmesmeur.sketchit.diagram.UmlDiagramsGenerator.generateClassDiagrams(UmlDiagramsGenerator.java:35)
org.pmesmeur.sketchit.SketchIt.generatePlantUmlDiagram(SketchIt.java:75)
org.pmesmeur.sketchit.SketchIt.generatePlantUmlDiagramWithExceptionHandling(SketchIt.java:61)
org.pmesmeur.sketchit.SketchIt.generatePlantUmlModel(SketchIt.java:53)
org.pmesmeur.sketchit.SketchIt.actionBody(SketchIt.java:45)
org.pmesmeur.sketchit.SketchIt.access$000(SketchIt.java:12)
org.pmesmeur.sketchit.SketchIt$1.run(SketchIt.java:32)
com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:980)
org.pmesmeur.sketchit.SketchIt.runInsideAnIntellijWriteAction(SketchIt.java:30)
org.pmesmeur.sketchit.SketchIt.actionPerformed(SketchIt.java:24)
com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:282)
com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$actionPerformed$0(ActionMenuItem.java:296)
com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:281)
com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:77)
com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:285)
java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$0(ActionMenuItem.java:112)
com.intellij.openapi.application.TransactionGuardImpl.performUserActivity(TransactionGuardImpl.java:94)
com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:112)
com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:519)
com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:36)
com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:541)
java.desktop/java.awt.Component.processMouseEvent(Component.java:6654)
java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3345)
java.desktop/java.awt.Component.processEvent(Component.java:6419)
java.desktop/java.awt.Container.processEvent(Container.java:2263)
java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5029)
java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
java.desktop/java.awt.Component.dispatchEvent(Component.java:4861)
java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2773)
java.desktop/java.awt.Component.dispatchEvent(Component.java:4861)
java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:778)
java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
java.base/java.security.AccessController.doPrivileged(Native Method)
java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
java.desktop/java.awt.EventQueue$5.run(EventQueue.java:751)
java.desktop/java.awt.EventQueue$5.run(EventQueue.java:749)
java.base/java.security.AccessController.doPrivileged(Native Method)
java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:748)
com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:971)
com.intellij.ide.IdeEventQueue.dispatchMouseEvent(IdeEventQueue.java:906)
com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:838)
com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:452)
com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:744)
com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$9(IdeEventQueue.java:451)
com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:802)
com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:505)
java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
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