Cant save any snippet

[eliquame]

I try to add snippet with plugin. It seems to be good, but when I go to back the snippets list, I can see only a empty list with create your first snippet.
I tried out with lots of different snippets.

In Wordpres debug log founded this:
PHP Deprecated: str_contains(): Passing null to parameter #1 ($haystack) of type string is deprecated in /public_html/wp-content/plugins/easy-code-manager/app/Helpers/Helper.php on line 331