edit

service/agent/lib/Agreement.php

@@ -259,7 +259,7 @@ class Agreement
                 $up['agreement_name'] = $this->name($agreement, $up, $role);
 
                 if ($sign) {
-                    $up['sign'] = '';
+                    $up['sign'] = 'null';
                     $up['status'] = 1;
                 }
                 $state = Dever::db('agent/member_agreement')->update($up);