diff --git a/adminer/include/pdo.inc.php b/adminer/include/pdo.inc.php
index 3567727b..8c3e103b 100644
--- a/adminer/include/pdo.inc.php
+++ b/adminer/include/pdo.inc.php
@@ -94,7 +94,7 @@ if (extension_loaded('pdo')) {
 		function fetch_field() {
 			$row = (object) $this->getColumnMeta($this->_offset++);
 			$row->type = $row->pdo_type; //! map to MySQL numbers
-			$row->charsetnr = (in_array("blob", (array) $row->flags) ? 63 : 0);
+			$row->charsetnr = (isset($row->flags) && in_array("blob", (array) $row->flags) ? 63 : 0);
 			return $row;
 		}