diff --git a/iguana/iguana_blocks.c b/iguana/iguana_blocks.c
index a6a3fcbe3..fc05c4a39 100755
--- a/iguana/iguana_blocks.c
+++ b/iguana/iguana_blocks.c
@@ -494,7 +494,9 @@ struct iguana_block *_iguana_chainlink(struct iguana_info *coin,struct iguana_bl
         //char str[65]; printf("extend? %s.h%d: %.15f vs %.15f ht.%d vs %d\n",bits256_str(str,block->RO.hash2),height,block->PoW,coin->blocks.hwmchain.PoW,height,coin->blocks.hwmchain.height);
         if ( iguana_blockvalidate(coin,&valid,newblock,0) < 0 || valid == 0 )
             return(0);
-        block->RO.hash2 = *hash2p = basilisk_blockhash(coin,height);
+        block->RO.hash2 = basilisk_blockhash(coin,height);
+        if ( hash2p != 0 )
+            *hash2p = block->RO.hash2;
         block->height = height;
         block->valid = 1;
         if ( block->PoW >= hwmchain->PoW )