GenerateSerialVersionUID exception with Selena 6733

I wasn't generating a UID - just browsing the IDEA menus looking for new goodies.

update failed for AnAction with ID=Generate: Argument 0 for @NotNull parameter of com/intellij/psi/impl/PsiManagerImpl.findFile must not be null
java.lang.IllegalArgumentException: Argument 0 for @NotNull parameter of com/intellij/psi/impl/PsiManagerImpl.findFile must not be null
at com.intellij.psi.impl.PsiManagerImpl.findFile(PsiManagerImpl.java)
at org.intellij.plugins.serial.GenerateSerialVersionUIDHandler.getPsiJavaClass(GenerateSerialVersionUIDHandler.java:100)
at org.intellij.plugins.serial.GenerateSerialVersionUIDAction.update(GenerateSerialVersionUIDAction.java:38)
at com.intellij.openapi.editor.actionSystem.EditorAction.update(EditorAction.java:73)
at com.intellij.openapi.actionSystem.ActionGroupUtil.isGroupEmpty(ActionGroupUtil.java:40)
at com.intellij.openapi.actionSystem.ActionGroupUtil.isGroupEmpty(ActionGroupUtil.java:27)
at com.intellij.openapi.actionSystem.ActionGroupUtil.isGroupEmpty(ActionGroupUtil.java:17)
at com.intellij.codeInsight.generation.actions.GenerateAction.update(GenerateAction.java:1)
at com.intellij.openapi.actionSystem.impl.Utils.a(Utils.java:2)
at com.intellij.openapi.actionSystem.impl.Utils.expandActionGroup(Utils.java:75)
at com.intellij.openapi.actionSystem.impl.Utils.fillMenu(Utils.java:19)
at com.intellij.openapi.actionSystem.impl.ActionMenu.f(ActionMenu.java:27)
at com.intellij.openapi.actionSystem.impl.ActionMenu.access$400(ActionMenu.java:8)
at com.intellij.openapi.actionSystem.impl.ActionMenu$MenuListenerImpl.menuSelected(ActionMenu.java:7)
at javax.swing.JMenu.fireMenuSelected(Unknown Source)
at javax.swing.JMenu$MenuChangeListener.stateChanged(Unknown Source)
at javax.swing.DefaultButtonModel.fireStateChanged(Unknown Source)
at javax.swing.DefaultButtonModel.setSelected(Unknown Source)
at javax.swing.JMenu.setSelected(Unknown Source)
at javax.swing.JMenu.menuSelectionChanged(Unknown Source)
at com.intellij.openapi.actionSystem.impl.ActionMenu.menuSelectionChanged(ActionMenu.java:63)
at javax.swing.MenuSelectionManager.setSelectedPath(Unknown Source)
at javax.swing.plaf.basic.BasicMenuUI$Handler.mouseEntered(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.trackMouseEnterExit(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:165)
at com.intellij.ide.IdeEventQueue.a(IdeEventQueue.java:125)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:83)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

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