Update Error from 9.0.11 to 9.1.7

Dear Community,
I have an error by updating my own cloud server I don't really understand.

At the Moment I run owncloud version 9.0.11 on my MacMini (Sierra) by MacServer.
I tryed the updater on the web interface and get this error (*1), which leads to a complete shutdown of the cloud. The only way to get it back running is to use my TimeMaschine and restore the whole owncloud file from before the update.
I hope you guys have an idea how i can solve this "problem"
As you may guess, I am not the most advanced IT guy around, I just got the owncloud running and I am happy with it. But I really want to do the update.

Thank you for your help and a happy new year

Kilian

(*1)

This is shown below the AppsUpdate:

e [Symfony\Component\Process\Exception\ProcessFailedException] e
The command "php /Library/Server/Web/Data/Sites/owncloud/occ --no-warnings upgrade" failed.
Exit Code: 5(Unknown error) e
Output: e
================ e e
Set log level to debug e e
Turned on maintenance mode e e
Checking whether the database schema can be updated (this can take a long time depending on the database size) e e
Checked database schema update e e
Checking updates of apps e e
Checking whether the database schema for eeee can be updated (this can take a long time depending on the database size) e e
Checked database schema update for apps e e
Updating database schema e e
Updated database e e
Exception: files can't be disabled. e e
Update failed e e
Maintenance mode is kept active e e
Reset log level e e
Error Output: e e
================ e e e
[1A DROP INDEX activity_time e e
0/14 [>---------------------------] 0% e e e
[1A DROP INDEX activity_time e e
1/14 [==>-------------------------] 7% e e e
[1A DROP INDEX activity_user_time e e
2/14 [====>-----------------------] 14% e e e
[1A DROP INDEX activity_filter_by e e
3/14 [======>---------------------] 21% e e e
[1A DROP INDEX activity_filter_app e e
4/14 [========>-------------------] 28% e e
e[1A CREATE TEMPORARY TABLE tempoc_activity AS SELECT acti... e e
5/14 [==========>-----------------] 35% e e
e[1A DROP TABLE oc_activity e e
6/14 [============>---------------] 42% e e e
[1A CREATE TABLE oc_activity (activity_id INTEGER NOT NULL, t... e e
7/14 [==============>-------------] 50% e e
e[1A INSERT INTO oc_activity (activity_id, timestamp, priority... e e
8/14 [================>-----------] 57% e e e
[1A DROP TABLE tempoc_activity e e
9/14 [==================>---------] 64% e e e
[1A CREATE INDEX activity_time ON oc_activity (timestamp) e e
10/14 [====================>-------] 71% e e
e[1A CREATE INDEX activity_user_time ON oc_activity (affectedu... e e
11/14 [======================>-----] 78% e e e
[1A CREATE INDEX activity_filter_by ON oc_activity (affectedu... e e
12/14 [========================>---] 85% e e
e[1A CREATE INDEX activity_filter_app ON oc_activity (affected... e e
13/14 [==========================>-] 92% e e
e[1A CREATE INDEX activity_object ON oc_activity ("object_type... e e
14/14 [============================] 100% e e

e eupgrade:upgradeShippedAppse

Seems to be that the posted logs got stripped/truncated somehow.

and how could i fix that?

What i have tried to say is that your posted information is incomplete as there are information stripped away while you have copy'n'pasted it in here.