diff --git a/idea/src/org/jetbrains/kotlin/idea/quickfix/ChangeFunctionSignatureFix.java b/idea/src/org/jetbrains/kotlin/idea/quickfix/ChangeFunctionSignatureFix.java
index 7554a5c5ef7..5d8f84b1611 100644
--- a/idea/src/org/jetbrains/kotlin/idea/quickfix/ChangeFunctionSignatureFix.java
+++ b/idea/src/org/jetbrains/kotlin/idea/quickfix/ChangeFunctionSignatureFix.java
@@ -87,7 +87,7 @@ public abstract class ChangeFunctionSignatureFix extends JetIntentionAction<PsiE
         }
 
         for (PsiElement declaration : declarations) {
-            if (!QuickFixUtil.canModifyElement(declaration)) {
+            if (!declaration.isValid() || !QuickFixUtil.canModifyElement(declaration)) {
                 return false;
             }
         }