To reproduce this error, just go to any link, e.g., http://clics.lingpy.org/all.php?gloss=village and try to hit any of the links in the IDS-key column. The reason why this one does not work is that the bibliograhic popup searches for href-keys with the keyword "key". In this case, it thus misunderstands that we're not at all talking about bibtex-keys, and therefore produces the error.