I created a custom print format in frappe, but when i try to print pdf it throws an error, as shown

Traceback (most recent call last):
File “apps/frappe/frappe/website/serve.py”, line 18, in get_response
response = renderer_instance.render()
File “apps/frappe/frappe/website/page_renderers/template_page.py”, line 84, in render
html = self.get_html()
File “apps/frappe/frappe/website/utils.py”, line 517, in cache_html_decorator
html = func(*args, **kwargs)
File “apps/frappe/frappe/website/page_renderers/template_page.py”, line 95, in get_html
self.update_context()
File “apps/frappe/frappe/website/page_renderers/template_page.py”, line 162, in update_context
data = self.run_pymodule_method(“get_context”)
File “apps/frappe/frappe/website/page_renderers/template_page.py”, line 224, in run_pymodule_method
return method(self.context)
File “apps/frappe/frappe/www/printview.py”, line 68, in get_context
“title”: frappe.utils.strip_html(doc.get_title() or doc.name),
File “apps/frappe/frappe/utils/data.py”, line 1478, in strip_html
return _striptags_re.sub(“”, text)
TypeError: expected string or bytes-like object