From 0534632d2ba9c4b4e56c8fe03bab6b737fdfaa37 Mon Sep 17 00:00:00 2001
From: UdjinM6 <UdjinM6@dash.org>
Date: Mon, 12 Sep 2016 21:06:59 +0300
Subject: [PATCH] add cs_main lock to GetCollateralAge

---
 src/masternode.cpp | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/masternode.cpp b/src/masternode.cpp
index c4b6699a0d..bc497ba995 100644
--- a/src/masternode.cpp
+++ b/src/masternode.cpp
@@ -205,18 +205,23 @@ void CMasternode::Check(bool forceCheck)
 
 int CMasternode::GetCollateralAge()
 {
-    if (chainActive.Height() < 0) return -1;
+    int nHeight;
+    {
+        TRY_LOCK(cs_main, lockMain);
+        if(!lockMain || !chainActive.Tip()) return -1;
+        nHeight = chainActive.Height();
+    }
 
     if (nCacheCollateralBlock == 0) {
         int nInputAge = GetInputAge(vin);
         if(nInputAge > 0) {
-            nCacheCollateralBlock = chainActive.Height() - nInputAge;
+            nCacheCollateralBlock = nHeight - nInputAge;
         } else {
             return nInputAge;
         }
     }
 
-    return chainActive.Height() - nCacheCollateralBlock;
+    return nHeight - nCacheCollateralBlock;
 }
 
 void CMasternode::UpdateLastPaid(const CBlockIndex *pindex, int nMaxBlocksToScanBack)