Uptime says ERROR: INVALID URI "/"

Uptime show site down for 18 hours, but it’s not down

https://gyazo.com/2318179f56acad9a14450fc5c258aa91

Could you please fix this? When repaired, we need to just make sure we re-set those values to 0% Downtime if we can. Otherwise, the reports will reflect it and that would be bad.