diff --git a/libraries/controllers/table/TableSearchController.php b/libraries/controllers/table/TableSearchController.php
index c2c7462e41..134cace445 100644
--- a/libraries/controllers/table/TableSearchController.php
+++ b/libraries/controllers/table/TableSearchController.php
@@ -460,10 +460,10 @@ class TableSearchController extends TableController
             return;
         }
         $key = array_search($field, $this->_columnNames);
-        $search_index = 0;
-        if (PMA_isValid(intval($_REQUEST['it']), 'numeric')) {
-            $search_index = $_REQUEST['it'];
-        }
+        $search_index
+            = ((isset($_REQUEST['it']) && is_numeric($_REQUEST['it']))
+                ? intval($_REQUEST['it']) : 0);
+
         $properties = $this->getColumnProperties($search_index, $key);
         $this->response->addJSON(
             'field_type', htmlspecialchars($properties['type'])