Deprecated notices caused by passing null to add_submenu_page

There are several deprecation notices caused by passing null to add_submenu_page first parameter in admin-menu.php lines 35 and 43:

Deprecated: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in .../wp-includes/functions.php on line 7300

Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in .../wp-includes/functions.php on line 2189

Deprecated: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in .../wp-includes/functions.php on line 7300

Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in .../wp-includes/functions.php on line 2189

Deprecated: strip_tags(): Passing null to parameter #1 ($string) of type string is deprecated in .../wp-admin/admin-header.php on line 36