Invalid argument supplied for foreach () in [path] / includes / class_postbit.php (294)

[Valdo]

Since I have upgraded vbet, whenever I rename a discussion of this error:

Warning: Invalid argument supplied for foreach () in [path] / includes / class_postbit.php (294): eval () 'd code on line 27

Warning: Invalid argument supplied for foreach () in [path] / includes / class_postbit.php (294): eval () 'd code on line 27

How do I fix this?
Thanks