NPE occured

[KisaragiEffective]

Stacktrace:

java.lang.NullPointerException
	at com.cybrosis.catdea.CatdeaServiceImpl.projectJdkChanged(CatdeaServiceImpl.java:74)
	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.util.EventDispatcher.dispatchVoidMethod(EventDispatcher.java:132)
	at com.intellij.util.EventDispatcher.access$000(EventDispatcher.java:26)
	at com.intellij.util.EventDispatcher$1.invoke(EventDispatcher.java:90)
	at com.sun.proxy.$Proxy168.projectJdkChanged(Unknown Source)
	at com.intellij.openapi.roots.impl.ProjectRootManagerImpl.lambda$projectJdkChanged$0(ProjectRootManagerImpl.java:221)
	at com.intellij.openapi.roots.impl.ProjectRootManagerImpl.mergeRootsChangesDuring(ProjectRootManagerImpl.java:292)
	at com.intellij.openapi.roots.impl.ProjectRootManagerImpl.projectJdkChanged(ProjectRootManagerImpl.java:221)
	at com.intellij.openapi.roots.impl.ProjectRootManagerImpl.setProjectSdk(ProjectRootManagerImpl.java:216)
	at com.intellij.ide.util.projectWizard.JdkChooserPanel.lambda$chooseAndSetJDK$6(JdkChooserPanel.java:310)
	at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1054)
	at com.intellij.ide.util.projectWizard.JdkChooserPanel.chooseAndSetJDK(JdkChooserPanel.java:304)
	at com.intellij.openapi.roots.ui.configuration.IdeaProjectSettingsService.chooseAndSetSdk(IdeaProjectSettingsService.java:141)
	at com.android.tools.idea.gradle.structure.editors.AndroidProjectSettingsService.chooseAndSetSdk(AndroidProjectSettingsService.java:324)
	at com.intellij.codeInsight.daemon.impl.JavaProjectSdkSetupValidator.doFix(JavaProjectSdkSetupValidator.java:72)
	at com.intellij.codeInsight.daemon.impl.SdkSetupNotificationProvider.lambda$createNotificationPanel$0(SdkSetupNotificationProvider.java:33)
	at com.intellij.ui.EditorNotificationPanel$1.hyperlinkActivated(EditorNotificationPanel.java:127)
	at com.intellij.ui.HyperlinkAdapter.hyperlinkUpdate(HyperlinkAdapter.java:28)
	at com.intellij.ui.HyperlinkLabel.fireHyperlinkEvent(HyperlinkLabel.java:201)
	at com.intellij.ui.HyperlinkLabel.processMouseEvent(HyperlinkLabel.java:124)
	at java.awt.Component.processEvent(Component.java:6315)
	at java.awt.Container.processEvent(Container.java:2239)
	at java.awt.Component.dispatchEventImpl(Component.java:4899)
	at java.awt.Container.dispatchEventImpl(Container.java:2297)
	at java.awt.Component.dispatchEvent(Component.java:4721)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4904)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4532)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4476)
	at java.awt.Container.dispatchEventImpl(Container.java:2283)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	at java.awt.Component.dispatchEvent(Component.java:4721)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:766)
	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:74)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
	at java.awt.EventQueue$4.run(EventQueue.java:739)
	at java.awt.EventQueue$4.run(EventQueue.java:737)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:736)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:729)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:674)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:373)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
	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)

Thing I have done before this: just change jdk.