2 files changed, 17 insertions, 1 deletions
diff --git a/app/Model/Base.php b/app/Model/Base.php
index a15f071c..902ab269 100644
--- a/app/Model/Base.php
+++ b/app/Model/Base.php
@@ -97,6 +97,22 @@ abstract class Base extends \Core\Base
     }
 
     /**
+     * Force some fields to be null if empty
+     *
+     * @access public
+     * @param  array        $values    Input array
+     * @param  string[]     $keys      List of keys
+     */
+    public function convertNullFields(array &$values, array $keys)
+    {
+        foreach ($keys as $key) {
+            if (array_key_exists($key, $values) && empty($values[$key])) {
+                $values[$key] = null;
+            }
+        }
+    }
+
+    /**
      * Build SQL condition for a given time range
      *
      * @access protected
diff --git a/app/Model/User.php b/app/Model/User.php
index 5792a549..fd2ec954 100644
--- a/app/Model/User.php
+++ b/app/Model/User.php
@@ -279,7 +279,7 @@ class User extends Base
 
         $this->removeFields($values, array('confirmation', 'current_password'));
         $this->resetFields($values, array('is_admin', 'is_ldap_user', 'is_project_admin', 'disable_login_form'));
-        $this->removeEmptyFields($values, array('gitlab_id'));
+        $this->convertNullFields($values, array('gitlab_id'));
         $this->convertIntegerFields($values, array('gitlab_id'));
     }