6. Common issues

6.1. Caught MultipleObjectsReturned while rendering

After upgrading to a new version with an existing database, you encounter something like:

Caught MultipleObjectsReturned while rendering: get() returned more than one CacheKey – it returned 12! Lookup parameters were {‘key’: ‘cms-menu_nodes_en_1_1_user’, ‘language’: ‘en’, ‘site’: 1L}

What has happened is that your database contains some old cache data in the menus_cachekey table. Just delete all those entries.

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