Initial file missing stops search_index_task

[Golem28]

In our moodle the following problem occurs and blocks the search_index_task

Execute scheduled task: Indizierung für die globale Suche (core\task\search_index_task)
... started 07:07:39. Current memory use 27.1 MB.
Processing area: Inhalt des Textblocks
  No new documents to index.
Processing area: Kurse
  Processed 23 records containing 23 documents, in 0.2 seconds.
Processing area: Nutzerdefinierte Kursfelder
  No new documents to index.
Processing area: Kursabschnitte
... used 185 dbqueries
... used 0.8199200630188 seconds
Scheduled task failed: Indizierung für die globale Suche (core\task\search_index_task),mod_collabora/initialfilemissing
Backtrace:
* line 421 of /mod/collabora/classes/api/collabora_fs.php: call to mod_collabora\api\collabora_fs->get_initial_file()
* line 369 of /mod/collabora/classes/api/collabora_fs.php: call to mod_collabora\api\collabora_fs->create_file()
* line 209 of /mod/collabora/classes/api/collabora_fs.php: call to mod_collabora\api\collabora_fs->create_retrieve_file()
* line 220 of /mod/collabora/lib.php: call to mod_collabora\api\collabora_fs->__construct()

does someone have some workaround or solution to this problem?

Thx