Update erpnext docker from 13.6.0 to 13.19.0 ends with error 503

I have a docker installation of erpnext using this:

My current installation has v13.6.0. Now I tried to upgrade to v13.19.0.

When I do so I get error 503 with the message: “The system is being updated. Please refresh again after a few moments.”

When I open the console tools in Chrome I found messages like this:

“Failed to load resource: the server responded with a status of 503 ()”

which refer to some “/website_script.js”.

I have also tried to setup a new site and export/import the existing mysql database but with same result.

What is the correct way of upgrading for a docker installation?

I have solved this now.

As described here the database migration did not work because of NULL values in the costs column of the “tabSubscription Plan Detail” table.

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