[3.1.2] update_batch not work

@Narf

Thank you for fixing that. Much appreciated.

I just spent 2-3 hours scratching my head and thinking 'Why is that not working?'. I thought I was going mad, outputting everything, var_dumping everything, reading the docs again and again, it was telling me the where clause was not finding the id field and it was from a big complex form, with variable amounts of input fields and validation rules, and I was sure I must have been doing something daft.

Then I thought to check the forums, and here it is, bug already found and fixed. Thank you. You are a superstar! Updated the system database file to the latest on github and all is peaceful and wonderful with update_batch once again :-)

Best wishes,

Paul.