I'm facing a problem I can't resolve even with options(shiny.trace=TRUE)
It is a webapp that uploads a file and then you click that button to scan() the file you uploaded. When you upload the file all works well. But when you forget uploading the file, the actionButton makes Shiny to abort R, because "R encountered a fatal error".
The output of the debugging function is "RCV {"method":"update","data":{"button:shiny.action":1}} before it aborts.
Before the scan function I write a if(input$button > 0 && !is.null(uploadedFile)) but it stills aborts. (This if statement is within an observe({}) statement.
I've searched around the web but there's nobody who has faced this problem, it seems the problem is within the call of the actionButton... that doesn't manage to do "nothing" when is pressed.
Thank you
Solved: Was a "variable naming" problem. And after finding that, I realized the button wasn't needed in the webapp. Thank you all