From ade5fe39aa9f21f646abceb9fa2d28770fa90b22 Mon Sep 17 00:00:00 2001
From: Pavel Dolgov <pavel.dolgov@jetbrains.com>
Date: Wed, 26 Sep 2018 13:00:53 +0300
Subject: [PATCH] Java: Fixed AIOOBE (EA-127922)

---
 .../refactoring/util/duplicates/ExtractedParameter.java        | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/java/java-analysis-impl/src/com/intellij/refactoring/util/duplicates/ExtractedParameter.java b/java/java-analysis-impl/src/com/intellij/refactoring/util/duplicates/ExtractedParameter.java
index d9de7aafbfc0..1ad7b2bf208c 100644
--- a/java/java-analysis-impl/src/com/intellij/refactoring/util/duplicates/ExtractedParameter.java
+++ b/java/java-analysis-impl/src/com/intellij/refactoring/util/duplicates/ExtractedParameter.java
@@ -97,7 +97,8 @@ public class ExtractedParameter {
     Set<PsiExpression> firstUsages = null;
     for (Match match : matches) {
       List<ExtractedParameter> parameters = match.getExtractedParameters();
-      PsiElement[] candidateElements = ContainerUtil.find(candidates, elements -> match.getMatchStart() == elements[0]);
+      PsiElement[] candidateElements = ContainerUtil.find(candidates,
+                                                          elements -> elements.length != 0 && match.getMatchStart() == elements[0]);
       Set<PsiVariable> candidateVariables = ContainerUtil.map2SetNotNull(parameters, parameter -> parameter.myCandidate.myVariable);
       if (candidateElements == null || containsModifiedField(candidateElements, candidateVariables)) {
         continue;