I have a WebApp that have some `renderUI({})`

... and some of them depend on the input of another.

This makes that, briefly, a red error in the webpage appear when I select some options. Because the `if()`

clause of some `renderUI({})`

depend on the input of a selectizer. The error says something like "The length of the argument is 0" (As the `if()`

depends on a `TRUE/FALSE`

, but in that exact moment it is not TRUE nor FALSE). After a second or so, it works good.

This could be done via a `Sys.sleep()`

after the first `if()`

but I don't know if it's the best option.

Thank you.

Edit - Reproducible code:

ui.R

```
radioButtons(
inputId="select",
label="Some selectizer",
choices=list(
"Yes",
"No"
),
selected="No",
inline=TRUE
),
uiOutput("select1"),
uiOutput("option2")
```

server.R

```
output$select1 <- renderUI({
if (input$select == "No")
return()
else radioButtons(
inputId="select1",
label="Some additional selector",
choices=list(
"Yes",
"No"
),
selected="No",
inline=TRUE)
})
output$option2 <- renderUI({
if (input$select == "Yes"){
if (input$select1 == "Yes"){
textInput("option2", "Some textInput: "),
}
else return()
}
})
```

Answer:

some reproducible code would allow me to give you some example code, but in the absence of that...

wrap what you currently have in another `if()`

, checking for length = 0 (or just `&&`

it, with the `NULL`

check first), and display your favorite placeholder message.

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