ics modification_failed after upgrade from 4.2.2

hello list,
we got an modification_error with webdav/ics calendars after upgrade 
from horde/kronolith:

client configuration: tb 31.2.0, lightning 3.3.1 (ics)
horde: horde 5.2.2, kronolith 4.2.3, horde_dav 1.1.1, horde_http 2.1.1, 
horde_icalendar 2.0.10

the debug shows only one error line:
EMERG: HORDE [kronolith] Call to a member function getInstance() on a 
non-object [pid 26675 on line 296 of "/var/www/horde/kronolith/lib/Api.php"]
(but this is before some sql queries on kronolith)

so on our legacy system:
horde 5.2.1, kronolith 4.2.2, horde_dav 1.1.0, horde_http 2.1.1, 
horde_icalendar 2.0.9
the PUT command from the same client configuration runs without the 
modification_error.

can you reproduce the error? thanks for help.
best regards rene

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