[ic] IC 5.6.0 to 5.6.3 Post Form Fails with 500 Server Error

[IC]

> 
> Where is this filter defined? Maybe this filter causes the internal server
> error.
> 

In catalog.cfg

CodeDef sprintf Filter 
CodeDef sprintf Routine <<EOR
sub {
        my ($value, $name, $fmt) = @_;

        if ($fmt) {
                return sprintf($fmt, $value);
        } else {
                return $value;
        }
}
EOR

Best regards
Andy.