Product page is missing

#1
HI There,
I have installed LS Cache on PS 1.7.8.1. The caches is working fine on CMS, home and category pages, but no product pages coming up.
In debug I am getting this error (irrespective which products).
Does anyone have an idea what todo. It is not related to theme, it looks like core issue.

Thanks for any idea in advance!

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