Document won't save - cannot set property '$k' of undefined

Hello,

i had a document that won't save and now i get this error every time the cron job runs:

[documentserver_community] Error: OCA\DocumentServer\Document\DocumentConversionException: change_code: !0!==this.xz?this.Ua:this.ym[a]);if(!1!==e){var h=d.fa.splice(e,1);d.IW(h);AscCommon.Rd.H4(d,e,1);0<e?e<=d.fa.length-1?(d.fa[e-1].$k=d.fa[e],d.fa[e].pk=d.fa[e-1]):d.fa[e-1].$k=null:e<=d.fa.length-1&&(d.fa[e].pk=null);0<=e&&e<=d.fa.length-1&&(d.sh&&d.sh.Nma(e,1),d.j4(e))}}};ak.prototype.vR=function(d){return this.Oa!==d.Oa||AscDFH.aya!==d.ka&&AscDFH.bya!==d.ka?!1:!0};ak.prototype.Mm=function(){return this.DR(Fr)};kl.prototype=Object.create(AscDFH.nm.prototype);kl.prototype.constructor=kl;kl.prototype.ka=
change: Uncaught TypeError: Cannot set property '$k' of undefined
DoctRenderer:<result><error index="3790" /></result>
 at <<closure>>

0. /var/www/html/nextcloud/apps/documentserver_community/lib/DocumentConverter.php line 123
   OCA\DocumentServer\Document\ConverterBinary->run("/tmp/oc_tmp_wpPIBz-.xml", null)
1. /var/www/html/nextcloud/apps/documentserver_community/lib/DocumentConverter.php line 78
   OCA\DocumentServer\DocumentConverter->runCommand(OCA\DocumentServ ... {})
2. /var/www/html/nextcloud/apps/documentserver_community/lib/Document/DocumentStore.php line 151
   OCA\DocumentServer\DocumentConverter->saveChanges("*** sensitive parameter replaced ***", ["78;AgAAADEA//8 ... "], "/srv/nextcloud- ... t", "odt")
3. /var/www/html/nextcloud/apps/documentserver_community/lib/LocalAppData.php line 100
   OCA\DocumentServer\Document\DocumentStore->OCA\DocumentServer\Document\{closure}("*** sensitive parameters replaced ***")
4. /var/www/html/nextcloud/apps/documentserver_community/lib/Document/DocumentStore.php line 164
   OCA\DocumentServer\LocalAppData->getReadWriteLocalPath(OC\Files\SimpleFS\SimpleFolder {}, Closure {})
5. /var/www/html/nextcloud/apps/documentserver_community/lib/Document/SaveHandler.php line 56
   OCA\DocumentServer\Document\DocumentStore->saveChanges(627642030, [OCA\DocumentSer ... }])
6. /var/www/html/nextcloud/apps/documentserver_community/lib/BackgroundJob/Cleanup.php line 69
   OCA\DocumentServer\Document\SaveHandler->flushChanges(627642030)
7. /var/www/html/nextcloud/lib/public/BackgroundJob/Job.php line 79
   OCA\DocumentServer\BackgroundJob\Cleanup->run(null)
8. /var/www/html/nextcloud/cron.php line 125
   OCP\BackgroundJob\Job->execute(OC\BackgroundJob\JobList {}, OC\Log {})

I can also reproduce this error with occ documentserver:flush

Any idea how i can remove the corrupted file?
I tried reinstalling documentserver_community + ONLYOFFICE without success.

Reproduce the failure with occ documentserver:flush, then trace the stack from BackgroundJob/Cleanup.php line 69 through Document/SaveHandler.php line 56 and Document/DocumentStore.php line 151 to DocumentConverter.php line 123. Determine how the affected document can be removed or repaired, and confirm that the cron job and manual flush complete without the conversion error.