I’m on bbpress 1.1-r2537 and adding tags in topics displays this error:
Warning: Invalid argument supplied for foreach() in [path]/bb-includes/backpress/class.wp-taxonomy.php on line 1789
Catchable fatal error: Object of class WP_Error could not be converted to string in [path]/bb-includes/functions.bb-formatting.php on line 241
Please note I’ve substituted the actual file path with [path].
Sometimes only the 2nd error is displayed, sometimes both. I believe this problem was introduced in 1.1-r2530 because that revision changed class.wp-taxonomy.php.
The tags don’t update through AJAX, but after refreshing the page, the new tag does show.