From 9da88bbd0f7ca4740d85b88c8ad3fea56e50f1f1 Mon Sep 17 00:00:00 2001
From: Denis Zharkov <denis.zharkov@jetbrains.com>
Date: Mon, 23 Mar 2015 10:58:30 +0300
Subject: [PATCH] Check if element is valid before checking it's writable

Otherwise it may lead to exception
---
 .../kotlin/idea/quickfix/ChangeFunctionSignatureFix.java        | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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;
             }
         }