After update only a white page with "Update in process" message

I just tried updating from NC 13.0.3 to 13.0.4.
First error message came when creating the backup, then I restarted the process.

Since then I get a white page with the message Update in process .

Here is the log

2018-06-15T04:30:28+0200 Qi2EO90txA [info] storage location: /home/users/zsemberi/www/cloud/data/updater-ochycxll0hj9/downloads/
2018-06-15T04:30:29+0200 Qi2EO90txA [info] end of verifyIntegrity()
2018-06-15T04:30:29+0200 Qi2EO90txA [info] endStep("6")
2018-06-15T04:30:29+0200 tocYUKvaPD [info] request to updater
2018-06-15T04:30:29+0200 tocYUKvaPD [info] currentStep()
2018-06-15T04:30:29+0200 tocYUKvaPD [info] Step 6 is in state "end".
2018-06-15T04:30:29+0200 tocYUKvaPD [info] POST request for step "7"
2018-06-15T04:30:29+0200 tocYUKvaPD [info] startStep("7")
2018-06-15T04:30:29+0200 tocYUKvaPD [info] extractDownload()
2018-06-15T04:30:29+0200 tocYUKvaPD [info] storage location: /home/users/zsemberi/www/cloud/data/updater-ochycxll0hj9/downloads/
2018-06-15T04:30:39+0200 tocYUKvaPD [info] end of extractDownload()
2018-06-15T04:30:39+0200 tocYUKvaPD [info] endStep("7")
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] request to updater
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] currentStep()
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] Step 7 is in state "end".
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] POST request for step "8"
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] startStep("8")
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] replaceEntryPoints()
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] replace index.php
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] replace status.php
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] replace remote.php
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] replace public.php
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] replace ocs/v1.php
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] replace ocs/v2.php
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] end of replaceEntryPoints()
2018-06-15T04:30:39+0200 pqSxkjuh3B [info] endStep("8")
2018-06-15T04:30:39+0200 8zY6Zv0ckD [info] request to updater
2018-06-15T04:30:39+0200 8zY6Zv0ckD [info] currentStep()
2018-06-15T04:30:39+0200 8zY6Zv0ckD [info] Step 8 is in state "end".
2018-06-15T04:30:39+0200 8zY6Zv0ckD [info] POST request for step "9"
2018-06-15T04:30:39+0200 8zY6Zv0ckD [info] startStep("9")
2018-06-15T04:30:39+0200 8zY6Zv0ckD [info] deleteOldFiles()
2018-06-15T04:30:45+0200 8zY6Zv0ckD [info] config sample exists
2018-06-15T04:30:45+0200 8zY6Zv0ckD [info] themes README exists
2018-06-15T02:41:36+0000 lDAL1a6dOi [info] updater cli is executed
2018-06-15T02:41:36+0000 lDAL1a6dOi [info] currentStep()
2018-06-15T02:41:36+0000 lDAL1a6dOi [info] Step 9 is in state "start".
2018-06-15T02:42:56+0000 f1GREUlS0E [info] updater cli is executed
2018-06-15T02:42:56+0000 f1GREUlS0E [info] currentStep()
2018-06-15T02:42:56+0000 f1GREUlS0E [info] Step 9 is in state "start".
2018-06-15T02:44:33+0000 AcJKL8oJyF [info] updater cli is executed
2018-06-15T02:44:33+0000 AcJKL8oJyF [info] currentStep()
2018-06-15T02:44:33+0000 AcJKL8oJyF [info] Step 9 is in state "start".
2018-06-15T02:47:19+0000 iM03b0Emrc [info] updater cli is executed
2018-06-15T02:47:19+0000 iM03b0Emrc [info] currentStep()
2018-06-15T02:47:19+0000 iM03b0Emrc [info] Step 9 is in state "start".
2018-06-15T02:53:49+0000 9QR6KDzNoZ [info] updater cli is executed
2018-06-15T02:53:49+0000 9QR6KDzNoZ [info] currentStep()
2018-06-15T02:53:49+0000 9QR6KDzNoZ [info] Step 9 is in state "start".