I'm getting the same error but only on reports where the date filter is on.
this worked
Replaced lines 165 - 167
$key = clean_param($key, PARAM_CLEANHTML);
$val = clean_param($val, PARAM_CLEANHTML);
$formdata->{$key} = $val;
with
$key = clean_param($key, PARAM_CLEANHTML);
if (is_array($val)) {
$val = clean_param_array($val, PARAM_CLEANHTML);
} else {
$val = clean_param($val, PARAM_CLEANHTML);
}
Thanks
John