Table.setVisibleColumns breaks render of form without any error

Hi,
this is to help you if you get the same problem.
Table.(…) brokes rendering of the form without any message.
Form was not displayed.

Reason was:
accidentally used a one property name twice, like setVisibleColumns(new String{ “aaa”,“bbb”,“aaa”})

I recommend to add one more check in Table.setVisibleColumns

thanks