diff --git a/stratum/coind_aux.cpp b/stratum/coind_aux.cpp
index a3ac346..2a86ebd 100644
--- a/stratum/coind_aux.cpp
+++ b/stratum/coind_aux.cpp
@@ -59,8 +59,11 @@ vector<string> coind_aux_hashlist(YAAMP_COIND_AUX **auxs, int size)
 			char hash_be[1024];
 			memset(hash_be, 0, 1024);
 
-			string_be(auxs[i]->hash, hash_be);
-			hashlist.push_back(hash_be);
+			if(auxs[i]->hash != NULL)
+			{
+				string_be(auxs[i]->hash, hash_be);
+				hashlist.push_back(hash_be);
+			}
 		}
 		else
 			hashlist.push_back("0000000000000000000000000000000000000000000000000000000000000000");