diff --git a/core/modules/system/system.post_update.php b/core/modules/system/system.post_update.php
index 01797aff5d..5de9e8cd02 100644
--- a/core/modules/system/system.post_update.php
+++ b/core/modules/system/system.post_update.php
@@ -229,6 +229,9 @@ function system_post_update_set_actions_default_weight() {
   foreach ($config_factory->listAll('system.action.') as $action_name) {
     $action = $config_factory->getEditable($action_name);
     $data = $action->getRawData();
+    if (!empty($data['weight'])) {
+      continue;
+    }
 
     // Set appropriate weights to node actions, otherwise set 0 as default
     // weight for other actions.