After some more testing i've spotted a error again:
Code:
Changing Shell to /bin/false...Done
Locking Password...Done
Error while adding 'USER' to 'cpanelsuspended' at /usr/local/cpanel/Cpanel/Sys/Group.pm line 216.
Cpanel::Sys::Group::_croak("Error while adding 'USER' to 'cpanelsuspended'") called at /usr/local/cpanel/Cpanel/Sys/Group.pm line 154
Cpanel::Sys::Group::add_member(Cpanel::Sys::Group=HASH(0x2042488), "USER") called at /usr/local/cpanel/Whostmgr/Accounts/Suspension/SSH.pm line 38
Whostmgr::Accounts::Suspension::SSH::suspend("USER") called at /usr/local/cpanel/Whostmgr/Accounts/CommandQueue.pm line 76
Whostmgr::Accounts::CommandQueue::__ANON__() called at /usr/local/cpanel/Cpanel/CommandQueue.pm line 61
Cpanel::CommandQueue::__ANON__() called at /usr/local/cpanel/3rdparty/perl/524/lib64/perl5/cpanel_lib/Try/Tiny.pm line 98
eval {...} called at /usr/local/cpanel/3rdparty/perl/524/lib64/perl5/cpanel_lib/Try/Tiny.pm line 89
Try::Tiny::try(CODE(0x1ac3bd8), Try::Tiny::Catch=REF(0xe518d0)) called at /usr/local/cpanel/Cpanel/CommandQueue.pm line 76
Cpanel::CommandQueue::run(Cpanel::CommandQueue=HASH(0x1d5c160)) called at /usr/local/cpanel/Whostmgr/Accounts/CommandQueue.pm line 82
Whostmgr::Accounts::CommandQueue::_init_and_do_action("Whostmgr::Accounts::Suspend", "username", "USER", "action", "suspend", "undo_action", "unsuspend") called at /usr/local/cpanel/Whostmgr/Accounts/Suspend.pm line 23
Whostmgr::Accounts::Suspend::new("Whostmgr::Accounts::Suspend", "USER") called at /usr/local/cpanel/scripts/suspendacct line 200
scripts::suspendacct::__ANON__() called at /usr/local/cpanel/3rdparty/perl/524/lib64/perl5/cpanel_lib/Try/Tiny.pm line 98
eval {...} called at /usr/local/cpanel/3rdparty/perl/524/lib64/perl5/cpanel_lib/Try/Tiny.pm line 89
Try::Tiny::try(CODE(0x1ac32f0), Try::Tiny::Catch=REF(0x1979e18)) called at /usr/local/cpanel/scripts/suspendacct line 204
scripts::suspendacct::run("USER", "", "") called at /usr/local/cpanel/scripts/suspendacct line 49
Suspending mysql users
Suspending websites...
Suspending FTP accounts...
Suspending outgoing email....Done
USER's account has been suspended