Not sure, I read on a Russian forum something about payment details should go here though it's very vague, this code comes up, any ideas?

That odd line in the output suggests you are using an outdated Language Pack and/or possibly an outdated Theme.

Switch to an unedited English language pack, and an unedited Theme. Does the same error happen? If it does, please file a ticket to support. 

Turns out to be a bug in 4.4.5, if you remove USD currency and add another like say GBP after creating a payment option, it will mess up that payment option and display this error, to correct you'll need to re add the payment description again if you have this problem. Been told it will be fixed in 4.4.6

Nothing to do with laungauge or theme.

Odd bug, but glad to see it got addressed and is fixed in next release.