diff --git a/adminer/drivers/mysql.inc.php b/adminer/drivers/mysql.inc.php
index c59e9695..a3b2bceb 100644
--- a/adminer/drivers/mysql.inc.php
+++ b/adminer/drivers/mysql.inc.php
@@ -111,7 +111,7 @@ if (!defined("DRIVER")) {
 				$result = @($unbuffered ? mysql_unbuffered_query($query, $this->_link) : mysql_query($query, $this->_link)); // @ - mute mysql.trace_mode
 				$this->error = "";
 				if (!$result) {
-					$this->errrno = mysql_errno($this->_link);
+					$this->errno = mysql_errno($this->_link);
 					$this->error = mysql_error($this->_link);
 					return false;
 				}
diff --git a/adminer/include/pdo.inc.php b/adminer/include/pdo.inc.php
index ebe7c34d..47d26a36 100644
--- a/adminer/include/pdo.inc.php
+++ b/adminer/include/pdo.inc.php
@@ -40,6 +40,9 @@ if (extension_loaded('pdo')) {
 		function store_result($result = null) {
 			if (!$result) {
 				$result = $this->_result;
+				if (!$result) {
+					return false;
+				}
 			}
 			if ($result->columnCount()) {
 				$result->num_rows = $result->rowCount(); // is not guaranteed to work with all drivers
@@ -50,6 +53,9 @@ if (extension_loaded('pdo')) {
 		}
 		
 		function next_result() {
+			if (!$this->_result) {
+				return false;
+			}
 			$this->_result->_offset = 0;
 			return @$this->_result->nextRowset(); // @ - PDO_PgSQL doesn't support it
 		}