Validation Filter « Gravity Support Forums

I'm trying to use the gform_validation filter, but running into several errors.

add_filter( 'gform_validation_1', 'my_validation' );

function my_validation($validation_result ) {
}

Just running that code without any actual validation (adding validation results in more warnings), prints the following error after submission and page refresh:

Warning: Invalid argument supplied for foreach() in /my/server/path/wp-content/plugins/gravityforms/form_display.php on line 111

AND where the form confirmation or form would be, Oops! We could not locate your form..

I am absolutely certain there is a form with the ID of 1. I also am running gform_after_submission_1, but that shouldn't effect anything since that fires after validation and works just fine without the validation filter.

Side note, Using the Gravity Forms "gform validation" Hook links to a 404 pastie.org example.