[Here's the relevant code](https://plugins.trac.wordpress.org/browser/color-filters/tags/2.1.14/Functions/Update_Admin_Databases.php#L17):

```php
$wc_term = wp_insert_term(sanitize_text_field($_POST['Color_Name']), 'pa_ewd_uwcf_colors', $args);
update_term_meta($term['term_id'], 'EWD_UWCF_WC_Term_ID', $wc_term['term_id']);
```

You can see from the stack trace that `$wc_term` here must be a WP_Error object meaning that the wp_insert_term call failed. It would be useful to find out what that error is: I'd suggest adding
```
error_log( print_r( $wc_term, true ) );
```
between those two lines and reproducing the error again, then check your server or PHP error log to see the error details. After that I suggest you talk to the plugin authors and ask them to check `is_wp_error($wc_term)` here, and give them the error details too.