At this moment there is a syntax error in preprocess-page.inc
ParseError: syntax error, unexpected ')' in rijkshuisstijl_preprocess () (line 57 of
/var/www/html/web/sites/all/themes/rijkshuisstijl/preprocess/preprocess-page.inc).
This error breaks the entire website.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.