Add if (myProject.isDisposed()) return;

plugins/maven/src/main/java/org/jetbrains/idea/maven/project/MavenProjectsManager.java

@@ -262,6 +262,8 @@ public class MavenProjectsManager extends MavenSimpleProjectComponent
   private void listenForSettingsChanges() {
     getImportingSettings().addListener(new MavenImportingSettings.Listener() {
       public void autoImportChanged() {
+        if (myProject.isDisposed()) return;
+
         if (getImportingSettings().isImportAutomatically()) {
           scheduleImportAndResolve();
         }

plugins/maven/src/main/java/org/jetbrains/idea/maven/project/MavenProjectsManagerWatcher.java

@@ -266,6 +266,8 @@ public class MavenProjectsManagerWatcher {
     Runnable onCompletion = new Runnable() {
       @Override
       public void run() {
+        if (myProject.isDisposed()) return;
+
         if (forceImportAndResolve || myManager.getImportingSettings().isImportAutomatically()) {
           myManager.scheduleImportAndResolve();
         }