Item14274: Update breaks DBCachePlugin ("Can't use string "xxx" as a HASH ref)

I'm running Foswiki 2.1.2 with Michael's Nat Zoo and ClassificationPlugin installed.

Today DBCachePlugin (among 6 others) was updated. Now I'm getting the following errors in /working/logs/error.log on a lot of pages (but not all of them - at first glance, the errors don't seem to occur with topics that don't have an ClassifiedTopic form attached):

Can't use string ("Intern") as a HASH ref while "strict refs" in use at /var/www/wiki.gbsl.ch/Foswiki2.1.2/lib/Foswiki/Plugins/DBCachePlugin/Core.pm line 1187.

"Intern" is the name of the web that contains the topics that produce the errors.

I'm assuming the error is caused by DBCachePlugin, but I'm not sure if this is correct - it might also be related to another plugin that was updated (I updated 6 other plugins beside DBCachePlugin today).

-- PascalSchuppli - 16 Jan 2017

Also reported in Item14439

-- MichaelDaum - 28 Jul 2017

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