M32 testing error -- NPE in stateChanged()

Got this after creating a new project with Scaffold sample using IntelliJ CE. Opened in new window (did not test reusing existing window). Reproducible with Card sample. Hiding then showing the Project view also generates the error. The error does not occur in projects generated without sample content.

@pq

java.lang.NullPointerException
	at com.android.tools.idea.uibuilder.editor.NlAbstractWindowManager$1.stateChanged(NlAbstractWindowManager.java:71)
	at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.intellij.util.messages.impl.MessageBusConnectionImpl.deliverMessage(MessageBusConnectionImpl.java:117)
	at com.intellij.util.messages.impl.MessageBusImpl.doPumpMessages(MessageBusImpl.java:397)
	at com.intellij.util.messages.impl.MessageBusImpl.pumpWaitingBuses(MessageBusImpl.java:358)
	at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:347)
	at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:331)
	at com.intellij.util.messages.impl.MessageBusImpl.sendMessage(MessageBusImpl.java:324)
	at com.intellij.util.messages.impl.MessageBusImpl.access$200(MessageBusImpl.java:29)
	at com.intellij.util.messages.impl.MessageBusImpl$2.invoke(MessageBusImpl.java:196)
	at com.sun.proxy.$Proxy66.stateChanged(Unknown Source)
	at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.fireStateChanged(ToolWindowManagerImpl.java:1559)
	at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.execute(ToolWindowManagerImpl.java:587)
	at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.execute(ToolWindowManagerImpl.java:576)
	at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.registerToolWindow(ToolWindowManagerImpl.java:1112)
	at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.registerToolWindow(ToolWindowManagerImpl.java:1051)
	at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.registerToolWindow(ToolWindowManagerImpl.java:1040)
	at com.jetbrains.lang.dart.ide.errorTreeView.DartProblemsView.lambda$new$1(DartProblemsView.java:106)
	at com.intellij.util.ui.UIUtil.invokeLaterIfNeeded(UIUtil.java:3048)
	at com.jetbrains.lang.dart.ide.errorTreeView.DartProblemsView.<init>(DartProblemsView.java:99)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at org.picocontainer.defaults.InstantiatingComponentAdapter.newInstance(InstantiatingComponentAdapter.java:193)
	at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.doGetComponentInstance(CachingConstructorInjectionComponentAdapter.java:85)
	at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.instantiateGuarded(CachingConstructorInjectionComponentAdapter.java:62)
	at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.getComponentInstance(CachingConstructorInjectionComponentAdapter.java:45)
	at com.intellij.openapi.components.impl.ServiceManagerImpl$MyComponentAdapter.getComponentInstance(ServiceManagerImpl.java:210)
	at com.intellij.util.pico.DefaultPicoContainer.getLocalInstance(DefaultPicoContainer.java:246)
	at com.intellij.util.pico.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:213)
	at com.intellij.openapi.components.ServiceManager.doGetService(ServiceManager.java:52)
	at com.intellij.openapi.components.ServiceManager.getService(ServiceManager.java:30)
	at com.jetbrains.lang.dart.ide.errorTreeView.DartProblemsView.getInstance(DartProblemsView.java:168)
	at com.jetbrains.lang.dart.analyzer.DartAnalysisServerService.clearAllErrors(DartAnalysisServerService.java:938)
	at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:315)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.doRun(LaterInvocator.java:435)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:419)
	at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:403)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762)
	at java.awt.EventQueue.access$500(EventQueue.java:98)
	at java.awt.EventQueue$3.run(EventQueue.java:715)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:732)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:719)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:668)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:363)
	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)

[stevemessick]

[✓] Flutter (Channel master, v1.1.10-pre.141, on Mac OS X 10.14.2 18C54, locale en-US)
    • Flutter version 1.1.10-pre.141 at /Users/messick/src/flutter/flutter
    • Framework revision f777db2b78 (2 days ago), 2019-01-22 10:37:22 -0800
    • Engine revision 05fee4eeee
    • Dart version 2.1.1 (build 2.1.1-dev.2.0 2e5453ddb4)

[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    • Android SDK at /Users/messick/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.3
    • Java binary at:
      /Volumes/Android/studio-master-dev/prebuilts/studio/jdk/mac/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b22)
    • All Android licenses accepted.

[✓] iOS toolchain - develop for iOS devices (Xcode 10.0)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 10.0, Build version 10A255
    • ios-deploy 1.9.4
    • CocoaPods version 1.5.2

[!] Android Studio
    • Android Studio at /Applications/Android Studio 3.4 Preview.app/Contents
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b22)

[✓] Android Studio (version 3.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 32.0.1
    • Dart plugin version 182.5124
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)

[!] Android Studio
    • Android Studio at /Applications/Android Studio 3.5 Preview.app/Contents
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b22)

[✓] IntelliJ IDEA Ultimate Edition (version 2018.3.3)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    • Flutter plugin version 31.3.4
    • Dart plugin version 183.5153.38

[✓] IntelliJ IDEA Community Edition (version 2018.3.3)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 32.0.3
    • Dart plugin version 183.5153.38

[✓] Connected device (1 available)
    • Android SDK built for x86 • emulator-5554 • android-x86 • Android 9 (API 28) (emulator)

! Doctor found issues in 2 categories.

[pq]

OK. I see what’s up. Fix in flight. ✈️