diff --git a/mbuni/extras/pgsql-queue/mms_pgsql_queue.c b/mbuni/extras/pgsql-queue/mms_pgsql_queue.c
index 845b3d8..e983a56 100644
--- a/mbuni/extras/pgsql-queue/mms_pgsql_queue.c
+++ b/mbuni/extras/pgsql-queue/mms_pgsql_queue.c
@@ -174,7 +174,7 @@ static void return_conn_real(PGconn *c, const char *function, const char *file,
      
      /*  debug("pg_cp", 0, "pg_release_conn> %s:%d, %s => %d", file, line, function, (int)c); */
 
-     if (free_conns == NULL) return;
+     if (free_conns == NULL || c == NULL) return;
      
      /* commit or destroy transaction. */
      if (PQtransactionStatus(c) == PQTRANS_INERROR)