Warning: Illegal string offset 'checkbox'

I DON’T know how to fix it. Sorry.

Is there a workaround, such as removing the checkboxes and only using the light style?

Working on solutions. Wait

Hey gang, it was a simple fix thanks to some quick searching on stackoverflow.

Looks like on line 19 of bbpress-new-ui/bbpress-new-ui.php you had:
if ($val['checkbox'] == 1) {

This was throwing the string offset warning beause $val is not an array because in the line before it you set:
$val = $val['checkbox']

So to fix it and correctly compare the value of $val just change line 19 to:
if ($val == 1) {

Changed it in my plugins -> editor (via the wordpress admin page) and everything works fine now.

Please update the plugin with this fix so everyone else can benefit from it. Thanks!

Looks like you had the same problem on line 66 of that file. Just change it there as well to look for $val == 1 vs. $val[‘checkbox’] == 1

It didn’t help because is not fixed problem with $val = $val[‘checkbox’]:
Notice: Uninitialized string offset: 0 in /home/a8330823/public_html/wp-content/plugins/bbpress-new-ui/bbpress-new-ui.php on line 18

But problem with “Warning: Illegal string offset ‘checkbox’ ” resolved, thx