browser() with Shiny is causing R session to Abort

Hi all,

Since I've upgraded, when i put browser() into a shiny app, I get the message "R encountered a fatal error. The session was terminated." Here is an example:

ui <- fluidPage(
actionButton('act1', "press me")
server <- function(session, input, output) {
observeEvent(input$act1, {
message("Do something")
shinyApp(ui, server)

My session gets killed at the browser() before it gets to the 'message("Do something"). Anyone know whats causing this and how to fix it?

Many thanks,

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