diff --git a/DB/DataObject.php b/DB/DataObject.php
index a2e989711..66acc833c 100644
--- a/DB/DataObject.php
+++ b/DB/DataObject.php
@@ -2804,7 +2804,7 @@ function _query($string)
         if (!empty($_DB_DATAOBJECT['CONFIG']['debug'])) {
             $this->debug(serialize($result), 'RESULT',5);
         }
-        if (method_exists($result, 'numRows')) {
+        if (is_object($result) && method_exists($result, 'numRows')) {
             if ($_DB_driver == 'DB') {
                 $DB->expectError(DB_ERROR_UNSUPPORTED);
             } else {