Warning: Error in map$get: key must be not be "" or NA

[Rahil_Thakur]

Hello ,
I was working on one of my shiny project and encounter an issue :

Warning: Error in map$get: key must be not be "" or NA
63: map$get
62: .values$get
61: .subset2(x, "impl")$get
60: [[.reactivevalues
58: observeEventExpr
1: runApp

This error come only if I update my shiny version from 1.3.0 to 1.4.0.2. Since It is coming in the complete project cannot figure out why and from where this error is coming.
On version 1.3.0 my shiny application works perfectly fine but if I update my shiny package it produces above error.

Also , i cannot create a REPEX code for the same since I don't know why and from where this error is coming.

Any suggestion or help will be highly appreciated.

[siddharthprabhu]

Hi @Rahil_Thakur, welcome to RStudio Community.

I believe that error message comes from the fastmap package which is used by Shiny since 1.4.0 (which is probably why you aren't encountering it with older versions). But it's hard to give advice on how to fix it without more details on what your code is actually doing.