diff --git a/idea/src/org/jetbrains/kotlin/idea/refactoring/move/moveDeclarations/ui/KotlinSelectNestedClassRefactoringDialog.kt b/idea/src/org/jetbrains/kotlin/idea/refactoring/move/moveDeclarations/ui/KotlinSelectNestedClassRefactoringDialog.kt
index a252f0daecd..e4cdb232a74 100644
--- a/idea/src/org/jetbrains/kotlin/idea/refactoring/move/moveDeclarations/ui/KotlinSelectNestedClassRefactoringDialog.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/refactoring/move/moveDeclarations/ui/KotlinSelectNestedClassRefactoringDialog.kt
@@ -85,8 +85,8 @@ internal class KotlinSelectNestedClassRefactoringDialog private constructor (
         private fun MoveKotlinNestedClassesToUpperLevelDialog(
                 nestedClass: KtClassOrObject,
                 targetContainer: PsiElement?
-        ): MoveKotlinNestedClassesToUpperLevelDialog {
-            val outerClass = nestedClass.containingClassOrObject!!
+        ): MoveKotlinNestedClassesToUpperLevelDialog? {
+            val outerClass = nestedClass.containingClassOrObject ?: return null
             val newTarget = targetContainer
                             ?: outerClass.containingClassOrObject
                             ?: outerClass.containingFile.let { it.containingDirectory ?: it }
@@ -119,7 +119,7 @@ internal class KotlinSelectNestedClassRefactoringDialog private constructor (
                     selectionDialog.getNextDialog() ?: return
                 }
             }
-            dialog.show()
+            dialog?.show()
         }
     }
 }
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