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Notice: Undefined index: provider in *_preprocess_block() [closed]

I am in the process of upgrading a site to Drupal 9. I finally have 9.2.0 in place, but I started seeing a very large number of notices, that all fit the pattern:

Notice: Undefined index: provider in block_theme_suggestions_block() (line 203 of core/modules/block/block.module).

This isn’t limited to just the block module, it seems to generate a notice in every implementation of hook_preprocess_block() (which is a lot).

It very well may be one of the custom blocks on this site, but I’ve compared those to the D9 documentation, and I don’t see anything amiss. I’ve also tried clearing the twig cache.

Update: I dropped a breakpoint in the spot where the error. The element in the variables array. The #plugin_id value is just "broken" and the content is a TranslatableMarkup with the value "This block is broken or missing. You may be missing content or you might need to enable the original module."

So I’m going to try the advice in How to fix a broken or missing block?

This article was republished from its original source.
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Notice: Undefined index: provider in *_preprocess_block() [closed]

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