#!/bin/sh -l" in generated Cron Scripts causes error

Hi there,

I installed OpenMedia Vault on debian 9 stretch dietpi.

The scripts that aregenareted by Open Media Vault start with "#!/bin/sh -l" which causesan error during execution:
"/DietPi/dietpi/func/dietpi-globals: Syntax error: Bad function name".

Leaving outhe"-l" works, but cant be configured within Open Media Vault.
Can someone help me?Whats wrong about "-l" in "#!/bin/sh -l" ?
What can I do to fix the error?

Thx!!!!!