I just got this error for the first time!

The last thing I did with contacts was to have a look at the "recent contacts" view (I think this was the first time ever that I looked there lol and then closed it from that view.

An hour later I was reading news (with the standard browser) and all of a sudden I get this yellow banner telling me "internal error contacts application closed".

As expected, whenever I tried opening the contacts it would close. I rebooted, but the problem was still there.

Somehow I suspected it had to do with the recent view in contacts, but I didn't know how to get out of there and start from the standard view.. UNTIL I tried just typing a name from the home screen: this opened the normal contacts view filtered to the keys I had typed.

After that, it's all OK now.

Note that I also have the extended search plugin, but didn't uninstall it or anything.