Scala plugin IllegalArgumentException: Argument 1 for @NotNull parameter must not be null

I just updated the Scala plugin and when I loaded a Java (non-Scala)
project, I get:

Argument 1 for @NotNull parameter of
org/jetbrains/plugins/scala/cache/ScalaLibraryCachesManager.generateCacheFilePath
must not be null
java.lang.IllegalArgumentException: Argument 1 for @NotNull parameter of
org/jetbrains/plugins/scala/cache/ScalaLibraryCachesManager.generateCacheFilePath
must not be null
at
org.jetbrains.plugins.scala.cache.ScalaLibraryCachesManager.generateCacheFilePath(Unknown
Source)
at
org.jetbrains.plugins.scala.cache.ScalaLibraryCachesManager.generateCacheFilePath(Unknown
Source)
at
org.jetbrains.plugins.scala.cache.ScalaLibraryCachesManager.addLibrary(Unknown
Source)
at
org.jetbrains.plugins.scala.cache.ScalaLibraryCachesManager.initLibraryCaches(Unknown
Source)
at
org.jetbrains.plugins.scala.cache.ScalaLibraryCachesManager$2.run(Unknown
Source)
at
com.intellij.ide.startup.impl.StartupManagerImpl.a(StartupManagerImpl.java:48)
at
com.intellij.ide.startup.impl.StartupManagerImpl.runPostStartupActivities(StartupManagerImpl.java:15)
at
com.intellij.openapi.project.impl.ProjectManagerImpl.openProject(ProjectManagerImpl.java:224)
at
com.intellij.openapi.project.impl.ProjectManagerImpl.loadAndOpenProject(ProjectManagerImpl.java:173)
at
com.intellij.openapi.project.impl.ProjectManagerImpl.loadAndOpenProject(ProjectManagerImpl.java:242)
at com.intellij.ide.impl.ProjectUtil.openProject(ProjectUtil.java:143)
at
com.intellij.ide.RecentProjectsManager$ReopenProjectAction.actionPerformed(RecentProjectsManager.java:2)
at
com.intellij.ui.popup.PopupFactoryImpl$ActionPopupStep$1.run(PopupFactoryImpl.java:3)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:33)
at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:174)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:57)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)


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