diff --git a/idea/src/org/jetbrains/kotlin/idea/quickfix/RemoveUselessIsCheckFixForWhen.kt b/idea/src/org/jetbrains/kotlin/idea/quickfix/RemoveUselessIsCheckFixForWhen.kt
index 833f9ec4829..89a3ea3c277 100644
--- a/idea/src/org/jetbrains/kotlin/idea/quickfix/RemoveUselessIsCheckFixForWhen.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/quickfix/RemoveUselessIsCheckFixForWhen.kt
@@ -29,8 +29,8 @@ class RemoveUselessIsCheckFixForWhen(element: KtWhenConditionIsPattern) : Kotlin
 
     override fun invoke(project: Project, editor: Editor?, file: KtFile) {
         val condition = element ?: return
-        val whenEntry = condition.parent as KtWhenEntry
-        val whenExpression = whenEntry.parent as KtWhenExpression
+        val whenEntry = condition.parent as? KtWhenEntry ?: return
+        val whenExpression = whenEntry.parent as? KtWhenExpression ?: return
 
         if (condition.isNegated) {
             condition.parent.delete()