Panic, exception while loading cache data

Questions
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2

Hi Daniel,

This is a known NuCache issue others have hit the exact same stack trace during migration. A few things to try:

1. Find the problematic node (https://our.umbraco.com/forum/using-umbraco-and-getting-started/109590-boot-failure-nucache):

sql

SELECT TOP 10 nodeId, LEN(data) as dataLength 
FROM cmsContentNu 
ORDER BY dataLength DESC

If any row is 1M+ characters, clear that entry and delete App_Data/TEMP/NuCache/ before retrying.

2. If that doesn’t fix it (https://our.umbraco.com/forum/using-umbraco-and-getting-started/109590-boot-failure-nucache), also check umbracoDocument / umbracoNode for broken records — someone hit the same error where cmsContentNu wasn’t the issue and tracked it down to 5 specific nodes there.

3. To get past v8 temporarily (https://github.com/umbraco/Umbraco-CMS/issues/12103), disable local DB entirely to force loading from the database instead:

xml

<NuCache IgnoreLocalDb="true" />

The reason staging worked but production didn’t is almost certainly a specific content node added in the last 4 years.

Note: This answer was created with the assistance of AI and is mostly correct please verify against the linked references.

EDIT: Daniel himself came back with the actual root cause and a great solution worth highlighting: