z-index error | WordPress.org

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I have the Gutenberg 15.1.1 plugin installed in WordPress 6.1.1

I placed the accordion inside a group and then made a reusable block out of it.

I also removed it from the reusable block and group and it’s still doing it.

I’m getting this error displayed on the live page that uses this block:

Warning: Undefined array key “zindex” in …/wp-content/plugins/easy-accordion-block/plugin.php on line 123

I looked it up and this is the line it mentions. What should I do to fix it?

line 123:		$custom_css .= '.'.$attributes['uniqueId'].' { z-index: '.$attributes['zindex'].'; }';

Thanks!