Fix condition see BT#11384

main/inc/ajax/model.ajax.php

@@ -109,6 +109,10 @@ $search = isset($_REQUEST['_search']) ? $_REQUEST['_search'] : false;
 $forceSearch = isset($_REQUEST['_force_search']) ? $_REQUEST['_force_search'] : false;
 $extra_fields = array();
 
+if (!empty($searchString)) {
+    $search = 'true';
+}
+
 if (($search || $forceSearch) && ($search !== 'false')) {
     $whereCondition = ' 1 = 1 ';
     $whereConditionInForm = getWhereClause($searchField, $searchOperator, $searchString);