mkdir Error

Hello guys,

i receive this error after every confirmation of configuration changes on my omv system:
Fehler #0:
exception 'OMV\ExecException' with message 'Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; mkdir --parents --mode=0700 '' 2>&1' with exit code '1': mkdir: cannot create directory '': No such file or directory' in /usr/share/php/openmediavault/system/process.inc:175
Stack trace:
#0 /usr/share/php/openmediavault/system/mountpoint.inc(98): OMV\System\Process->execute()
#1 /usr/share/openmediavault/engined/module/fstab.inc(65): OMV\System\MountPoint->create()
#2 /usr/share/openmediavault/engined/rpc/config.inc(194): OMVModuleFsTab->startService()
#3 [internal function]: OMVRpcServiceConfig->applyChanges(Array, Array)
#4 /usr/share/php/openmediavault/rpc/serviceabstract.inc(124): call_user_func_array(Array, Array)
#5 /usr/share/php/openmediavault/rpc/serviceabstract.inc(150): OMV\Rpc\ServiceAbstract->callMethod('applyChanges', Array, Array)
#6 /usr/share/php/openmediavault/rpc/serviceabstract.inc(528): OMV\Rpc\ServiceAbstract->OMV\Rpc\{closure}('/tmp/bgstatusfE...', '/tmp/bgoutputSh...')
#7 /usr/share/php/openmediavault/rpc/serviceabstract.inc(151): OMV\Rpc\ServiceAbstract->execBgProc(Object(Closure))
#8 /usr/share/openmediavault/engined/rpc/config.inc(213): OMV\Rpc\ServiceAbstract->callMethodBg('applyChanges', Array, Array)
#9 [internal function]: OMVRpcServiceConfig->applyChangesBg(Array, Array)
#10 /usr/share/php/openmediavault/rpc/serviceabstract.inc(124): call_user_func_array(Array, Array)
#11 /usr/share/php/openmediavault/rpc/rpc.inc(86): OMV\Rpc\ServiceAbstract->callMethod('applyChangesBg', Array, Array)
#12 /usr/sbin/omv-engined(536): OMV\Rpc\Rpc::call('Config', 'applyChangesBg', Array, Array, 1)
#13 {main}

How can i fix this?

What i exactly did: i removed a referenced disk from fstab and config.xml.
After i did a reboot on the system, i got this error.
I checked those two files again an i had a "ghost entry" in config.xml:
<mntent>
<uuid>75774256-6314-445f-8711-1cee4c37f440</uuid>
<fsname></fsname>
<dir></dir>
<type>ext4</type>
<opts>defaults,nofail,user_xattr,noexec,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0,acl</opts>
<freq>0</freq>
<passno>2</passno>
<hidden>0</hidden>
</mntent>

i saved this file as backup and deleted this entry. The error message disappeared.
I'll make a few more tests and keep you updated.