Right now the module gives many errors like:
Notice: Undefined index: #cache in blocache_block_build_alter() (line 35 of modules/contrib/blocache/blocache.module).
or
Notice: Undefined index: keys in blocache_block_build_alter() (line 35 of modules/contrib/blocache/blocache.module).
Because we do not get the id from the right place, we should get the id from the block, not from the cache keys.
Just enable the module and go to a page that renders a custom block that does not set cache tags.
Get the plugin id from the block.
Do it
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Fixed
2.0
Code
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Issue #3192913 by docapilar: Get the block id from the block