With jenkins version 1.500, when creating a new job as a copy of existing job,
the 'Status Code: 500' page is presented.

After coming back from the 'Error' page to the 'newJob' page
the field 'Copy existing Job':'Copy from' is empty.

A new empty job is nevertheless created,
it has the type of the parent job, but have no parent's configuration.

There is no such behavior with jenkins version 1.499 .

Logs are in attachment.