TypeError: Cannot read property 'getTime' of null

Got following error on my shiny-server :

Uncaught TypeError: Cannot read property 'getTime' of null
at Object._UTCDateAsLocal (input_binding_date.js:207)
at Object._setMin (input_binding_date.js:146)
at Object.initialize (input_binding_daterange.js:129)
at h (init_shiny.js:256)
at initShiny (init_shiny.js:274)

I tried restarting shiny-server, Nginx but nothing changed.
Can anyone tell me what's the issue?
Thanks