Unable to load file systems view

I am running the openmediavault-unionfilesystems 5.1.2 plugin on OMV 5.5.10-1. Whenever I click the File Systems tab, the page just says "Loading..." indefinitely.

Looking at the end of /var/log/syslog is:

Zitat

Sep 20 12:00:01 nas1 CRON[18583]: (root) CMD (/usr/sbin/omv-mkrrdgraph >/dev/null 2>&1)

Sep 20 12:03:37 nas1 omv-engined[19447]: PHP Fatal error: Uncaught Error: Call to a member function get() on null in /usr/share/php/openmediavault/system/filesys$

Sep 20 12:03:37 nas1 omv-engined[19447]: Stack trace:

Sep 20 12:03:37 nas1 omv-engined[19447]: #0 /usr/share/openmediavault/engined/rpc/filesystemmgmt.inc(430): OMV\System\Filesystem\Backend\Mergerfs->getImpl('939d2$

Sep 20 12:03:37 nas1 omv-engined[19447]: #1 [internal function]: Engined\Rpc\OMVRpcServiceFileSystemMgmt->getList(Array, Array)

Sep 20 12:03:37 nas1 omv-engined[19447]: #2 /usr/share/php/openmediavault/rpc/serviceabstract.inc(123): call_user_func_array(Array, Array)

Sep 20 12:03:37 nas1 omv-engined[19447]: #3 /usr/share/php/openmediavault/rpc/serviceabstract.inc(149): OMV\Rpc\ServiceAbstract->callMethod('getList', Array, Arr$

Sep 20 12:03:37 nas1 omv-engined[19447]: #4 /usr/share/php/openmediavault/rpc/serviceabstract.inc(588): OMV\Rpc\ServiceAbstract->OMV\Rpc\{closure}('/tmp/bgstatus$

Sep 20 12:03:37 nas1 omv-engined[19447]: #5 /usr/share/php/openmediavault/rpc/serviceabstract.inc(159): OMV\Rpc\ServiceAbstract->execBgProc(Object(Closure))

Sep 20 12:03:37 nas1 omv-engined[19447]: #6 /usr/share/openmediavault/engined/rpc/filesystemmgmt.inc(472): OMV\Rpc\ServiceAbstract->callMethodBg('getList', Array$

Sep 20 12:03:37 nas1 omv-engined[19447]: #7 [internal function]: Engined\Rpc\OMVR in /usr/share/php/openmediavault/system/filesystem/backend/mergerfs.inc on line$

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What can I do to resolve this issue?