03 June 2026, 20:29

Hi Jackie,

It sounds like you've encountered a text block where the configdata for it is either empty or malformed in some way.

Can you confirm this is the case?

Cheers

Robert

03 June 2026, 23:11

Hi Robert

None of the blocks have an empty configdata so we are going with corrupt data, the upgrade process is managing the unserialized data ok so its not that.

Our echo in the code did not reveal anything so have placed it elsewhere, and upgrading again....I'll post here in 2.5 hours time :)

Jackie

04 June 2026, 1:45

Hi Jackie,

I have encountered this issue as well - in this case it was configdata for records containing the value 'b:0;', which unserialised to false, which is then passed into the method that expects an array and causes the exception. I've opened a work item for it here.

In the meantime to get through the upgrade, I added a check prior to the failing line that will convert any false values to empty arrays.

04 June 2026, 2:39

Thanks so much Alex

 will try this now.

Jackie

05 June 2026, 2:45

Just an update now that we have managed to upgrade, after 5.5 hours :) and we have another site that is taking even longer.

In this case I located the blocks that were causing the issue and updated them, but going forward we will be inserting the code that ignores the corrupted blocks.

Thanks for everyone's help

08 June 2026, 15:44

Hi everyone,

The fix made it into the 26.04.1 release last Friday.

Cheers

Kristina