diff --git a/inc/container.class.php b/inc/container.class.php
index 6f38c4dd..997240e6 100644
--- a/inc/container.class.php
+++ b/inc/container.class.php
@@ -648,6 +648,10 @@ public function defineTabs($options = [])
 
     public function prepareInputForUpdate($input)
     {
+        if (!array_key_exists('label', $input)) {
+            return $input;
+        }
+
         return PluginFieldsToolbox::prepareLabel($input);
     }