diff --git a/src/cc/CCtx.cpp b/src/cc/CCtx.cpp
index 1048f7e35..5799f0b18 100644
--- a/src/cc/CCtx.cpp
+++ b/src/cc/CCtx.cpp
@@ -99,12 +99,17 @@ std::string FinalizeCCTx(uint64_t CCmask,struct CCcontract_info *cp,CMutableTran
     {
         if (i==0 && mtx.vin[i].prevout.n==10e8)
             continue;
-        if ( myGetTransaction(mtx.vin[i].prevout.hash,vintx,hashBlock) != 0 )
+        if ( myGetTransaction(mtx.vin[i].prevout.hash,vintx,hashBlock) != 0 && mtx.vin[i].prevout.n < vintx.vout.size() )
         {
             if ( vintx.vout[mtx.vin[i].prevout.n].scriptPubKey.IsPayToCryptoCondition() == 0 && ccvins==0)
                 normalvins++;            
             else ccvins++;
-        }            
+        }
+        else
+        {
+            fprintf(stderr,"vin.%d vout.%d is bigger than vintx.%d\n",i,mtx.vin[i].prevout.n,(int32_t)vintx.vout.size());
+            return("");
+        }
     }
     if (normalvins>1 && ccvins)
     {        
diff --git a/src/script/script.cpp b/src/script/script.cpp
index 475acdfd5..c821cd3bc 100644
--- a/src/script/script.cpp
+++ b/src/script/script.cpp
@@ -385,7 +385,9 @@ bool CScript::IsPayToCryptoCondition(CScript *pCCSubScript, std::vector<std::vec
 bool CScript::IsPayToCryptoCondition(CScript *pCCSubScript) const
 {
     std::vector<std::vector<unsigned char>> vParams;
-    return IsPayToCryptoCondition(pCCSubScript, vParams);
+    if ( pCCSubScript != 0 )
+        return IsPayToCryptoCondition(pCCSubScript, vParams);
+    else return(false);
 }
 
 bool CScript::IsPayToCryptoCondition() const