NullPointerException (ERROR - n.impl.NoSwingUnderWriteAction) while trying to generate Diagram

Sketch It shows unexpected exception whenever I try to generate diagram. Log in the following
2019-10-16 10:36:15,407 [ 161836]   INFO - .script.IdeScriptEngineManager - javax.script.ScriptEngineManager initialized in 297 ms 
2019-10-16 10:36:17,806 [ 164235]   INFO - org.pmesmeur.sketchit.SketchIt - Starting generation of PlantUML model for project bff 
2019-10-16 10:36:18,313 [ 164742]   INFO - rationStore.ComponentStoreImpl - Saving Project 'D:\ECSG\aBFF\bff.poc' bffRunManager took 50 ms, libraryTable took 22 ms 
2019-10-16 10:36:18,362 [ 164791]   INFO - t.diagram.UmlDiagramsGenerator - Generating project component diagram 
2019-10-16 10:36:18,367 [ 164796]   INFO - nent.ComponentDiagramGenerator - Starting to generate component diagram: BFF's Component Diagram 
2019-10-16 10:36:18,369 [ 164798]   INFO - nent.ComponentDiagramGenerator - Adding module dependencies: bff 
2019-10-16 10:36:18,369 [ 164798]   INFO - nent.ComponentDiagramGenerator - Adding module dependencies: bff.main 
2019-10-16 10:36:18,369 [ 164798]   INFO - nent.ComponentDiagramGenerator - Ending to generate component diagram: BFF's Component Diagram 
2019-10-16 10:36:18,536 [ 164965]  ERROR - n.impl.NoSwingUnderWriteAction - AWT events are not allowed inside write action: java.awt.event.InvocationEvent[INVOCATION_DEFAULT,runnable=sun.awt.GlobalCursorManager$NativeUpdater@5b745130,notifier=null,catchExceptions=false,when=1571200577703] on sun.awt.windows.WToolkit@4bdff830 
java.lang.Throwable: AWT events are not allowed inside write action: java.awt.event.InvocationEvent[INVOCATION_DEFAULT,runnable=sun.awt.GlobalCursorManager$NativeUpdater@5b745130,notifier=null,catchExceptions=false,when=1571200577703] on sun.awt.windows.WToolkit@4bdff830
    at com.intellij.openapi.diagnostic.Logger.error(Logger.java:145)
    at com.intellij.openapi.application.impl.NoSwingUnderWriteAction.lambda$watchForEvents$0(NoSwingUnderWriteAction.java:22)
    at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:427)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:117)
    at java.desktop/java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:190)
    at java.desktop/java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:235)
    at java.desktop/java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:233)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.desktop/java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:233)
    at java.desktop/java.awt.Dialog.show(Dialog.java:1063)
    at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl$MyDialog.show(DialogWrapperPeerImpl.java:707)
    at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl.show(DialogWrapperPeerImpl.java:432)
    at com.intellij.openapi.ui.DialogWrapper.doShow(DialogWrapper.java:1685)
    at com.intellij.openapi.ui.DialogWrapper.show(DialogWrapper.java:1644)
    at com.intellij.openapi.ui.messages.MessageDialog.show(MessageDialog.java:177)
    at com.intellij.ui.messages.MessagesServiceImpl.showMessageDialog(MessagesServiceImpl.java:70)
    at com.intellij.openapi.ui.Messages.showDialog(Messages.java:219)
    at com.intellij.openapi.ui.Messages.showDialog(Messages.java:178)
    at com.intellij.openapi.ui.Messages.showErrorDialog(Messages.java:791)
    at org.pmesmeur.sketchit.ui.ExceptionDialog.show(ExceptionDialog.java:13)
    at org.pmesmeur.sketchit.SketchIt.generatePlantUmlDiagramWithExceptionHandling(SketchIt.java:63)
    at org.pmesmeur.sketchit.SketchIt.generatePlantUmlModel(SketchIt.java:53)
    at org.pmesmeur.sketchit.SketchIt.actionBody(SketchIt.java:45)
    at org.pmesmeur.sketchit.SketchIt.access$000(SketchIt.java:12)
    at org.pmesmeur.sketchit.SketchIt$1.run(SketchIt.java:32)
    at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:994)
    at org.pmesmeur.sketchit.SketchIt.runInsideAnIntellijWriteAction(SketchIt.java:30)
    at org.pmesmeur.sketchit.SketchIt.actionPerformed(SketchIt.java:24)
    at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:265)
    at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:282)
    at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$actionPerformed$0(ActionMenuItem.java:292)
    at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:265)
    at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:107)
    at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:282)
    at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
    at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$0(ActionMenuItem.java:111)
    at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:82)
    at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:106)
    at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:115)
    at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:121)
    at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:111)
    at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:524)
    at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:35)
    at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:546)
    at java.desktop/java.awt.Component.processMouseEvent(Component.java:6651)
    at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
    at java.desktop/java.awt.Component.processEvent(Component.java:6416)
    at java.desktop/java.awt.Container.processEvent(Container.java:2263)
    at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5026)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4858)
    at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
    at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
    at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
    at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2773)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4858)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:778)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:751)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:749)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:748)
    at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:824)
    at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:769)
    at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:412)
    at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:704)
    at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:411)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
2019-10-16 10:36:18,540 [ 164969]  ERROR - n.impl.NoSwingUnderWriteAction - IntelliJ IDEA 2019.2.3  Build #IU-192.6817.14 
2019-10-16 10:36:18,541 [ 164970]  ERROR - n.impl.NoSwingUnderWriteAction - JDK: 11.0.4; VM: OpenJDK 64-Bit Server VM; Vendor: JetBrains s.r.o 
2019-10-16 10:36:18,541 [ 164970]  ERROR - n.impl.NoSwingUnderWriteAction - OS: Windows 10 
2019-10-16 10:36:18,547 [ 164976]  ERROR - n.impl.NoSwingUnderWriteAction - Plugin to blame: Sketch It! version: 0.07.00 
2019-10-16 10:36:18,547 [ 164976]  ERROR - n.impl.NoSwingUnderWriteAction - Last Action: Myplugin.Textboxes 
2019-10-16 10:36:18,699 [ 165128]   WARN - try.DefaultSentryClientFactory - No 'stacktrace.app.packages' was configured, this option is highly recommended as it affects stacktrace grouping and display on Sentry. See documentation: https://docs.sentry.io/clients/java/config/#in-application-stack-frames 
2019-10-16 10:36:18,711 [ 165140]   WARN - try.DefaultSentryClientFactory - No 'stacktrace.app.packages' was configured, this option is highly recommended as it affects stacktrace grouping and display on Sentry. See documentation: https://docs.sentry.io/clients/java/config/#in-application-stack-frames 
2019-10-16 10:36:19,638 [ 166067]   INFO - org.pmesmeur.sketchit.SketchIt - Ending generation of PlantUML model for project bff 
2019-10-16 10:36:21,374 [ 167803]   INFO - j.ide.plugins.RepositoryHelper - using cached plugin list (updated at 10/16/2019 10:12 AM) 
2019-10-16 10:36:21,653 [ 168082]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/addons_list-3.xml 
2019-10-16 10:36:21,881 [ 168310]   INFO - rationStore.ComponentStoreImpl - Saving Project 'D:\ECSG\aBFF\bff.poc' bffRunManager took 18 ms, libraryTable took 28 ms 
2019-10-16 10:36:21,883 [ 168312]   INFO - mponents.impl.stores.StoreUtil - saveProjectsAndApp took 222 ms 
2019-10-16 10:36:22,640 [ 169069]   INFO - dea.updater.SdkComponentSource - File C:\Users\User\.android\repositories.cfg could not be loaded. 
2019-10-16 10:36:22,644 [ 169073]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/sys-img/android-automotive/sys-img2-1.xml 
2019-10-16 10:36:22,646 [ 169075]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/sys-img/android-wear/sys-img2-1.xml 
2019-10-16 10:36:22,646 [ 169075]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/addon2-1.xml 
2019-10-16 10:36:22,649 [ 169078]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/sys-img/android-tv/sys-img2-1.xml 
2019-10-16 10:36:22,651 [ 169080]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/sys-img/google_apis/sys-img2-1.xml 
2019-10-16 10:36:22,651 [ 169080]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/extras/intel/addon2-1.xml 
2019-10-16 10:36:22,652 [ 169081]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/sys-img/android/sys-img2-1.xml 
2019-10-16 10:36:22,653 [ 169082]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/sys-img/google_apis_playstore/sys-img2-1.xml 
2019-10-16 10:36:22,660 [ 169089]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/repository2-1.xml 
2019-10-16 10:36:22,663 [ 169092]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/sys-img/android-wear-cn/sys-img2-1.xml 
2019-10-16 10:36:22,663 [ 169092]   INFO - dea.updater.SdkComponentSource - Downloading https://dl.google.com/android/repository/glass/addon2-1.xml
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