Recurring invoice not sending second invoice


I’m running version 1.5.9 and one month ago i switched my recurring setting to auto send. Today I had two invoices that should be send automaticaly. Only the first invoice was sent and the next one got the concept status.

Searching for old topics i found the same issue somewhere in june 2016 but could not find the solution. (Recurring Invoices - Drafts and
Apparently the issue has not been resolved…

Any help or answer would be appreciated.