TypeError: array_filter(): Argument #1 ($array) must be of type array

The solution proposed worked fine for me. Thanks for that - Marking as RTBC

This is the same fix of @maunm at #3307786-10: Error after installing CKEditor 5 - Font Plugin and as cited on this issue it's very importante so I'm updating the priority to "Major", ok?

My only suggestion in the code is to follow the S.O.L.I.D recommendation that says to avoid using the else clause

For example, instead of:

if(is_array($colors)) {
    return array_filter($colors, function ($clr) {
        return preg_match('/^#(?:[0-9a-f]{3}){1,2}$/i', $clr['color']);
    });
} else {
    return [];
}

We can verify first if we don't have $colors and return array [] as a default. If pass on this verification we return the "normal" value. Example:

if (empty($colors)) return [];

return array_filter($colors, function ($clr) {
    return preg_match('/^#(?:[0-9a-f]{3}){1,2}$/i', $clr['color']);
});

'

Updated the MR with this suggestion from #4, and I'm also uploading a patch for 1.1.2-beta1 so if someone needs as a workaround can apply that using composer

thank you @renatog patch 5 works great for me

The patch at #6 (patch 5) is working.

should that test on is_array() rather than empty()?

thanks everyone

Is there a chance to put this in a new release to get this module to a stable version?