diff --git a/idea/src/org/jetbrains/kotlin/idea/refactoring/inline/KotlinInlineValHandler.kt b/idea/src/org/jetbrains/kotlin/idea/refactoring/inline/KotlinInlineValHandler.kt
index bb97bffa891..232e901760e 100644
--- a/idea/src/org/jetbrains/kotlin/idea/refactoring/inline/KotlinInlineValHandler.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/refactoring/inline/KotlinInlineValHandler.kt
@@ -181,7 +181,7 @@ class KotlinInlineValHandler : InlineActionHandler() {
             project.executeWriteCommand(RefactoringBundle.message("inline.command", name)) {
                 val inlinedExpressions = chosenExpressions
                         .flatMap { referenceExpression ->
-                            if (assignments.contains(referenceExpression.parent)) return@flatMap emptyList<KtExpression>()
+                            if (assignments.contains(referenceExpression!!.parent)) return@flatMap emptyList<KtExpression>()
 
                             val importDirective = referenceExpression.getStrictParentOfType<KtImportDirective>()
                             if (importDirective != null) {