Upgrade from V12 to V13: frappe.local.module_app[scrub(module)]: keyerror: 'Chat'

Hi alll,
I have a site from V12 with chat enabled on website.
Now when upgrading to V13 during migration it checks for Website Settings and returns the below error

Executing frappe.patches.v13_0.website_theme_custom_scss in joch (_ad39d547af98446a)

Traceback (most recent call last):
File “/usr/lib/python3.8/runpy.py”, line 194, in _run_module_as_main
return _run_code(code, main_globals, None,
File “/usr/lib/python3.8/runpy.py”, line 87, in _run_code
exec(code, run_globals)
File “/home/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 110, in
main()
File “/home/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 20, in main
click.Group(commands=commands)(prog_name=“bench”)
File “/home/frappe/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 829, in call
return self.main(*args, **kwargs)
File “/home/frappe/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 782, in main
rv = self.invoke(ctx)
File “/home/frappe/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 1259, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/frappe/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 1259, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/frappe/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 1066, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/home/frappe/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 610, in invoke
return callback(*args, **kwargs)
File “/home/frappe/frappe-bench/env/lib/python3.8/site-packages/click/decorators.py”, line 21, in new_func
return f(get_current_context(), *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/commands/init.py”, line 31, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/commands/site.py”, line 433, in migrate
migrate(context.verbose, skip_failing=skip_failing, skip_search_index=skip_search_index)
File “/home/frappe/frappe-bench/apps/frappe/frappe/migrate.py”, line 73, in migrate
frappe.modules.patch_handler.run_all(skip_failing)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 47, in run_all
run_patch(patch)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 36, in run_patch
if not run_single(patchmodule=patch):
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 81, in run_single
return execute_patch(patchmodule, method, methodargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 105, in execute_patch
frappe.get_attr(patchmodule.split()[0] + “.execute”)()
File “/home/frappe/frappe-bench/apps/frappe/frappe/patches/v13_0/website_theme_custom_scss.py”, line 18, in execute
doc.save()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 310, in save
return self._save(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 364, in _save
self.run_post_save_methods()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1085, in run_post_save_methods
self.run_method(“on_update”)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 941, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1261, in composer
return composed(self, method, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1243, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 938, in fn
return method_object(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/doctype/website_theme/website_theme.py”, line 31, in on_update
self.clear_cache_if_current_theme()
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/doctype/website_theme/website_theme.py”, line 59, in clear_cache_if_current_theme
website_settings = frappe.get_doc(“Website Settings”, “Website Settings”)
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 1074, in get_doc
doc = frappe.model.document.get_doc(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 79, in get_doc
return controller(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 118, in init
self.load_from_db()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 185, in load_from_db
self.set(df.fieldname, children)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/base_document.py”, line 178, in set
self.extend(key, value)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/base_document.py”, line 229, in extend
self.append(key, v)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/base_document.py”, line 202, in append
value = self._init_child(value, key)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/base_document.py”, line 245, in _init_child
value = get_controller(value[“doctype”])(value)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/base_document.py”, line 82, in get_controller
site_controllers[doctype] = _get_controller()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/base_document.py”, line 64, in _get_controller
module = load_doctype_module(doctype, module_name)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/utils.py”, line 230, in load_doctype_module
app = get_module_app(module)
File “/home/frappe/frappe-bench/apps/frappe/frappe/modules/utils.py”, line 258, in get_module_app
return frappe.local.module_app[scrub(module)]
KeyError: ‘chat’

How to solve this?
Thanks in advance