Error while listing orders in backend

-- HikaShop version -- : 2.3.5
-- Joomla version -- : 3.3.6
-- Error-message(debug-mod must be tuned on) -- : DateTime::__construct() [datetime.--construct]: Failed to parse time string (19 Dezember 2014) at position 0 (1): Unexpected character

Hi,
I can't list my orders in the backend correctly. If I want to list some orders from last year, I'll get this error:

DateTime::__construct() [<a href='datetime.--construct'>datetime.--construct</a>]: Failed to parse time string (19 Dezember 2014) at position 0 (1): Unexpected character

I can get back ti the main backend page, but can't open my list of orders anymore.
Any ideas?
Thanks
Roger

Hi,

Normally, this should be the same as the problem described here:
www.hikashop.com/forum/install-update/87...-upgrade.html#177815
Now I'm not sure if you're saying that you only have the problem for some orders and not others ?
Anyway, try the fix in that other thread first.