From bdd5c15bfcfe43f401655ad8c0c442b045f5d02d Mon Sep 17 00:00:00 2001
From: Sowmya <106989392+SowmyaArunachalam@users.noreply.github.com>
Date: Thu, 19 Feb 2026 12:51:18 +0530
Subject: [PATCH] fix(module-def): add validation for rename (#37001)

---
 frappe/core/doctype/module_def/module_def.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/frappe/core/doctype/module_def/module_def.py b/frappe/core/doctype/module_def/module_def.py
index e00fb853d5..11586aa0b5 100644
--- a/frappe/core/doctype/module_def/module_def.py
+++ b/frappe/core/doctype/module_def/module_def.py
@@ -6,6 +6,7 @@ import os
 from pathlib import Path
 
 import frappe
+from frappe import _
 from frappe.model.document import Document
 from frappe.modules.export_file import delete_folder
 
@@ -89,6 +90,10 @@ class ModuleDef(Document):
 			frappe.clear_cache()
 			frappe.setup_module_map()
 
+	def before_rename(self, old, new, merge=False):
+		if not self.custom:
+			frappe.throw(_("Only Custom Modules can be renamed."))
+
 
 @frappe.whitelist()
 def get_installed_apps():