fix: ignore duplicate modules during install

frappe/installer.py

@@ -579,7 +579,7 @@ def add_module_defs(app):
 		d = frappe.new_doc("Module Def")
 		d.app_name = app
 		d.module_name = module
-		d.save(ignore_permissions=True)
+		d.insert(ignore_permissions=True, ignore_if_duplicate=True)
 
 
 def remove_missing_apps():