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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 ($haystack) of type string is deprecated in .../wp-includes/functions.php on line 7300Deprecated: str_replace(): Passing null to parameter #3 ($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