LWille

Here’s the full response I’m getting:

<br />
<b>Warning</b>:  call_user_func_array() expects parameter 1 to be a valid callback, function '' not found or invalid function name in <b>/var/www/htdocs/wp-includes/plugin.php</b> on line <b>213</b><br />
{"mailSent":true,"into":"#wpcf7-f434-p428-o1","captcha":{"captcha-585":"http:\/\/www.brahmsee.de\/files\/wpcf7_captcha\/699779504.png"},"message":"Ihre Nachricht wurde erfolgreich gesendet. Vielen Dank!"}

Same here on 4.2.2 multisite using theme Earthlingtwo.
Seems to be related to the new WP version, and rather not a theme / other plugin problem as usually advised in this forum.

When submitting the form, the request is processed properly, but the response is messed up by the following warning (sent to the browser before the actual JSON response, leading to a parse error unexpected token <):

<b>Warning</b>:  call_user_func_array() expects parameter 1 to be a valid callback, function '' not found or invalid function name in <b>/var/www/htdocs/wp-includes/plugin.php</b> on line <b>213</b>

After that, there’s the regular JSON confirmation message. This only happens when the mail is sent, not when there are validation errors.

Seems like they’re calling something the wrong way.

I’ll happily donate if this bug is fixed soon!

Any news on this issue?

I thought that the missing jos_categories.name field was a change needed for Joomla 1.6.1 – it was the only error I had when using the plugin. I changed it to jos_categories.title in lines 107-108 in the patch file and it seemed to work.