diff --git a/adminer/drivers/mssql.inc.php b/adminer/drivers/mssql.inc.php
index c0b6268e..423855e0 100644
--- a/adminer/drivers/mssql.inc.php
+++ b/adminer/drivers/mssql.inc.php
@@ -66,6 +66,9 @@ if (isset($_GET["mssql"])) {
 				if (!$result) {
 					$result = $this->_result;
 				}
+				if (!$result) {
+					return false;
+				}
 				if (sqlsrv_field_metadata($result)) {
 					return new Min_Result($result);
 				}
@@ -74,7 +77,7 @@ if (isset($_GET["mssql"])) {
 			}
 
 			function next_result() {
-				return sqlsrv_next_result($this->_result);
+				return $this->_result ? sqlsrv_next_result($this->_result) : null;
 			}
 
 			function result($query, $field = 0) {