Error during redisplay

[xmaillard]

Hello

looking into my messages buffer, I see many errors concerning chess:

Error during redisplay: (eval (chess-display-clock-string)) signaled (cl-assertion-failed game)
Error during redisplay: (eval (chess-game-tag chess-module-game "White")) signaled (cl-assertion-failed game)
Error during redisplay: (eval (chess-game-tag chess-module-game "Black")) signaled (cl-assertion-failed game)
Error during redisplay: (eval (chess-game-tag chess-module-game "Site")) signaled (cl-assertion-failed game)
Error during redisplay: (eval (let ((date (chess-game-tag chess-module-game "Date"))) (and (string-match "\\`\\([0-9]\\{4\\}\\)" date) (concat " " (match-string 1 date))))) signaled (cl-assertion-failed game)

Do you know where does this come from ?

"GNU Emacs 25.0.50.1 (x86_64-apple-darwin14.0.0, NS appkit-1343.16 Version 10.10.1 (Build 14B25)) of 2014-12-17 on kcals.intra.maillard.im"

Regards Xavier