"Invalid time value" error when showing Participants tab of a specific study

[smathot]

For one specific study that is part of the test run that we're doing now, an error message (see screenshot) appears whenever the Participants tab is selected. This only occurs for this study, and only for this tab. It does not appear to break any functionality.

The following output is copied from the console:

XHRGEThttp://localhost:3000/api/v1/studies/4/stats
[HTTP/1.1 500 Internal Server Error 17ms]

	
GET
	http://localhost:3000/api/v1/studies/4/stats
État
500
Internal Server Error
VersionHTTP/1.1
Transfert826 o (taille 65 o)
Politique de référentstrict-origin-when-cross-origin

    	
    Connection
    	keep-alive
    Content-Length
    	65
    Content-Type
    	application/json; charset=utf-8
    Date
    	Sat, 17 Sep 2022 13:03:09 GMT
    Keep-Alive
    	timeout=5
    Set-Cookie
    	adonis-session=2c0d3aa14946f285c6868c981e1d4a6abCthZFROzGx%2FpejV0k%2FP8bh1M8kEC%2FN3LUlpLvhzJf7EzlOvAJzy8%2FNnm98717dioz%2BTPknk4DVEbu8PgFE2%2Fbm3tGPa%2F4cyIEG4UQGBE4qSKX38sULTGm0w2%2BuuPubm; Path=/; HttpOnly; SameSite=Strict
    Set-Cookie
    	XSRF-TOKEN=3e1a22d6623bd685deceff4de27b0b9aM7qkvYNN7uCxlmc5CJHA%2BtPFAW88pWOCZNjtmbtRx3Yx303Wdam2z%2B4jT4uT7cXDLYYg8IMMBTrqFieZfwA2V1OaEXXUodjVjDCJMSI9ptHpfdoRH6SFUFDaKokSgoxX; Max-Age=7200; Path=/; SameSite=Strict
    X-Content-Type-Options
    	nosniff
    X-Download-Options
    	noopen
    X-Frame-Options
    	DENY
    X-XSS-Protection
    	1; mode=block
    	
    Accept
    	application/json, text/plain, */*
    Accept-Encoding
    	gzip, deflate, br
    Accept-Language
    	fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3
    Authorization
    	Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1aWQiOjIsImlhdCI6MTY2MzMyOTgzMiwiZXhwIjoxNjYzNTAyNjMyfQ.gmABfi7XHNlgilREQ0KZP3n7Xp-wMsoh7Az3RTsLQwI
    Connection
    	keep-alive
    Cookie
    	i18n_redirected=en; adonis-session=d3b52f5b018cd6f51fbf6bff19b309ee9CgmVmLYZn7agXELOVAPtIKOUIHFyME1s2Tegjx3FeDoh8E5JA%2BXncujPY0vVBgi%2FAkoeXQ9n3Eu3caVi8Bp80MFEOfalOtyRfcwbZhXhwSj3HU%2BQGuOWLU%2FAgyPOnkw; auth.strategy=local; auth._token.local=Bearer%20eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1aWQiOjIsImlhdCI6MTY2MzMyOTgzMiwiZXhwIjoxNjYzNTAyNjMyfQ.gmABfi7XHNlgilREQ0KZP3n7Xp-wMsoh7Az3RTsLQwI; adonis-session-values=247059d391fe87d6ee03837970408915UTSYkwxzomHq0BrEpn0NVsoJ4OX93kNohal2wOBfC7aeiXtzxfTikNu2mU3PL17GaK8SACpn6CIgneak3YOwFtij%2F7XqroZosj9CIWvBrZUQgNPycqeZvdbCL49jDq8YQCky2eq5dd74A7F50XscraAjyRg9anZCS800fg80DB0%3D; auth._refresh_token.local=false; XSRF-TOKEN=ac8e8645a7b7b59a508c4eb679b42a2bs9%2FFcygzIa%2BtL49W3Eau6VrRPaTUTnSNhXOUPdJGEpApbglLUXTjjDtGTs4SFHFQ4Lz0O8AwMS7eqDEYnN68nugXQqNZ09PlBhSHKQG9K0SDWxzhedI7hdVRWEUm1fG7
    Host
    	localhost:3000
    Referer
    	http://localhost:3000/dashboard/studies/4
    Sec-Fetch-Dest
    	empty
    Sec-Fetch-Mode
    	cors
    Sec-Fetch-Site
    	same-origin
    User-Agent
    	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:103.0) Gecko/20100101 Firefox/103.0
    X-XSRF-TOKEN
    	ac8e8645a7b7b59a508c4eb679b42a2bs9/FcygzIa+tL49W3Eau6VrRPaTUTnSNhXOUPdJGEpApbglLUXTjjDtGTs4SFHFQ4Lz0O8AwMS7eqDEYnN68nugXQqNZ09PlBhSHKQG9K0SDWxzhedI7hdVRWEUm1fG7

[nclaidiere]

This continues to happen occasionaly, the statistics panel is frozen, it doesn't update anymore.