Found error notice on the header

  • When I open SiteOrigin CSS (I use PageBuilder by SiteOrigine), there are have an error notice:
    ”
    Warning: preg_replace(): Compilation failed: escape sequence is invalid in character class at offset 4 in C:\xampp\htdocs\phamthang\wp-content\plugins\so-css\so-css.php on line 756
    ”
    How can I fix it or developer improve it?

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