Undefined property: stdClass::$old_type

I'm getting the following:

Undefined property: stdClass::$old_type in C:\wamp\www\sites\all\modules\serial\serial.module on line 124.

Changing line 124 to:

if(isset($info->old_type) && $info->old_type != $info->type) {

fixed it for me. sorry I don't have a proper patch i need to run out for a bit...