Menu Edit error

Summary

(Summarize the bug encountered concisely) When I try to edit the menu. it show this error. Server application error {"code":200,"message":"Flectra Server Error","data":{"name":"builtins.KeyError","debug":"Traceback (most recent call last):\n File "/opt/flectra/flectra/flectra/http.py", line 647, in _handle_exception\n return super(JsonRequest, self)._handle_exception(exception)\n File "/opt/flectra/flectra/flectra/http.py", line 307, in _handle_exception\n raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])\n File "/opt/flectra/flectra/flectra/tools/pycompat.py", line 87, in reraise\n raise value\n File "/opt/flectra/flectra/flectra/http.py", line 689, in dispatch\n result = self._call_function(self.params)\n File "/opt/flectra/flectra/flectra/http.py", line 339, in _call_function\n return checked_call(self.db, *args, kwargs)\n File "/opt/flectra/flectra/flectra/service/model.py", line 97, in wrapper\n return f(dbname, args, **kwargs)\n File "/opt/flectra/flectra/flectra/http.py", line 332, in checked_call\n result = self.endpoint(a, kw)\n File "/opt/flectra/flectra/flectra/http.py", line 933, in call\n return self.method(*args, kw)\n File "/opt/flectra/flectra/flectra/http.py", line 512, in response_wrap\n response = f(args, **kw)\n File "/opt/flectra/flectra/addons/web/controllers/main.py", line 976, in call_kw\n return self._call_kw(model, method, args, kwargs)\n File "/opt/flectra/flectra/addons/web/controllers/main.py", line 968, in _call_kw\n return call_kw(request.env[model], method, args, kwargs)\n File "/opt/flectra/flectra/flectra/api.py", line 687, in call_kw\n return call_kw_model(method, model, args, kwargs)\n File "/opt/flectra/flectra/flectra/api.py", line 672, in call_kw_model\n result = method(recs, args, **kwargs)\n File "/opt/flectra/flectra/addons/website/models/website.py", line 984, in save\n # del menu['is_homepage']\nKeyError: 'is_homepage'\n","message":"is_homepage","arguments":["is_homepage"],"exception_type":"internal_error"}}

Steps to reproduce

(How one can reproduce the issue - this is very important)
Edit Menu from front side,
Add Menu Entry,
Click "Save" of "Edit Menu";
Then the console show the log, and save faild.

What is the current bug behavior?

(What actually happens)

What is the expected correct behavior?

(What you should see instead)

Relevant logs and/or screenshots

(Paste any relevant logs - please use code blocks (```) to format console output, logs, and code as it's very hard to read otherwise.)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)