diff --git a/includes/model/ShiftEntry_model.php b/includes/model/ShiftEntry_model.php
index f84b312f..903bc544 100644
--- a/includes/model/ShiftEntry_model.php
+++ b/includes/model/ShiftEntry_model.php
@@ -34,6 +34,17 @@ function ShiftEntry_create($shift_entry) {
       `freeloaded`=" . sql_escape($shift_entry['freeloaded'] ? 'TRUE' : 'FALSE'));
 }
 
+/**
+ * Update a shift entry.
+ */
+function ShiftEntry_update($shift_entry) {
+  return sql_query("UPDATE `ShiftEntry` SET
+      `Comment`='" . sql_escape($shift_entry['Comment']) . "',
+      `freeload_comment`='" . sql_escape($shift_entry['freeload_comment']) . "',
+      `freeloaded`=" . sql_escape($shift_entry['freeloaded'] ? 'TRUE' : 'FALSE') . "
+      WHERE `id`=" . sql_escape($shift_entry['id']));
+}
+
 /**
  * Delete a shift entry.
  */
diff --git a/includes/pages/admin_user.php b/includes/pages/admin_user.php
index 87190857..4e10ca1e 100644
--- a/includes/pages/admin_user.php
+++ b/includes/pages/admin_user.php
@@ -215,7 +215,6 @@ function admin_user() {
             $user_source = sql_select("SELECT `Nick`, `UID` FROM `User` WHERE `UID` = '" . sql_escape($id) . "' LIMIT 1");
             sql_query("DELETE FROM `User` WHERE `UID`=" . sql_escape($id) . " LIMIT 1");
             sql_query("DELETE FROM `UserGroups` WHERE `uid`=" . sql_escape($id));
-            sql_query("UPDATE `ShiftEntry` SET `UID`=0, `Comment`=NULL WHERE `UID`=" . sql_escape($id));
             engelsystem_log("Deleted user " . User_Nick_render($user_source));
             $html .= success("Benutzer gelöscht!", true);
           } else {
diff --git a/includes/pages/user_myshifts.php b/includes/pages/user_myshifts.php
index 41ea9381..d74475d2 100644
--- a/includes/pages/user_myshifts.php
+++ b/includes/pages/user_myshifts.php
@@ -57,12 +57,15 @@ function user_myshifts() {
         
         $comment = strip_request_item_nl('comment');
         $user_source = User($shift['UID']);
-        sql_query("UPDATE `ShiftEntry` SET 
-            `Comment`='" . sql_escape($comment) . "',
-            `freeloaded`=" . sql_escape($freeloaded ? 1 : 0) . ",
-            `freeload_comment`='" . sql_escape($freeload_comment) . "'
-            WHERE `id`=" . sql_escape($id) . " 
-            LIMIT 1");
+        $result = ShiftEntry_update(array(
+            'id' => $id,
+            'Comment' => $comment,
+            'freeloaded' => $freeloaded,
+            'freeload_comment' => $freeload_comment 
+        ));
+        if ($result === false)
+          engelsystem_error('Unable to update shift entr.');
+        
         engelsystem_log("Updated " . User_Nick_render($user_source) . "'s shift " . $shift['name'] . " from " . date("y-m-d H:i", $shift['start']) . " to " . date("y-m-d H:i", $shift['end']) . " with comment " . $comment);
         success(_("Shift saved."));
         redirect(page_link_to('users') . '&action=view&user_id=' . $shifts_user['UID']);