From 957a0bbfb03d06bb47f37bc9c36c137a528f6805 Mon Sep 17 00:00:00 2001
From: Maxim Shafirov <max@jetbrains.com>
Date: Mon, 26 Mar 2012 14:24:19 +0400
Subject: [PATCH] Div by zero

---
 platform/util/src/com/intellij/util/io/PersistentHashMap.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/platform/util/src/com/intellij/util/io/PersistentHashMap.java b/platform/util/src/com/intellij/util/io/PersistentHashMap.java
index 3b33caea1ed9..161c173ba62c 100644
--- a/platform/util/src/com/intellij/util/io/PersistentHashMap.java
+++ b/platform/util/src/com/intellij/util/io/PersistentHashMap.java
@@ -222,6 +222,9 @@ public class PersistentHashMap<Key, Value> extends PersistentEnumeratorDelegate<
     if (fileSize > 5 * megabyte) { // file is longer than 5MB and (more than 50% of keys is garbage or approximate benefit larger than 100M)
       int liveKeys = (int)(myLiveAndGarbageKeysCounter / LIVE_KEY_MASK);
       int deadKeys = (int)(myLiveAndGarbageKeysCounter & 0xFFFFFFFF);
+
+      if (deadKeys < 50) return false;
+
       final int benefitSize = 100 * megabyte;
       final long avgValueSize = fileSize / (liveKeys + deadKeys);