Workaround for added @NotNull annotation on ProjectFileIndex.getInstance()

idea/idea-analysis/src/org/jetbrains/kotlin/idea/project/Platform.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * Copyright 2010-2016 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,8 +16,10 @@
 
 package org.jetbrains.kotlin.idea.project
 
+import com.intellij.openapi.components.ServiceManager
 import com.intellij.openapi.module.Module
 import com.intellij.openapi.module.ModuleUtilCore
+import com.intellij.openapi.roots.ProjectFileIndex
 import com.sampullara.cli.Argument
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.cli.common.arguments.CommonCompilerArguments
@@ -54,4 +56,9 @@ val Module.languageVersionSettings: LanguageVersionSettings
     }
 
 val KtElement.languageVersionSettings: LanguageVersionSettings
-    get() = ModuleUtilCore.findModuleForPsiElement(this)?.languageVersionSettings ?: LanguageVersionSettingsImpl.DEFAULT
+    get() {
+        if (ServiceManager.getService(ProjectFileIndex::class.java) == null) {
+            return LanguageVersionSettingsImpl.DEFAULT
+        }
+        return ModuleUtilCore.findModuleForPsiElement(this)?.languageVersionSettings ?: LanguageVersionSettingsImpl.DEFAULT
+    }