jsonlite error message about rhandsontable HOT 12 CLOSED

options(warn=-1)
library(rhandsontable)
library(shiny)

options(warn=-1)
quantity <- id <- 1:20
label <- paste0("lab","-",quantity)
pick <- FALSE
iris_ <- data.frame(id=id,pick=pick, quantity=quantity,label=label,iris[1:20,] ,stringsAsFactors = FALSE)

iris_$Species <- NULL
cols <- colnames(iris_)
#---------------------------
ui <- fluidPage(
    fluidRow(
        column(8,rHandsontableOutput('demTb')),
        column(3,uiOutput("demSli"))
        )
    )

server <- function(session, input, output) {


output$demSli <- renderUI({

if(is.null(input$demTb) ) return()

isolate({
df_ <- hot_to_r(input$demTb)
index <- which(df_$pick==T)
if(length(index)==0) return()
labs <- iris_$label[index] 
pages <- "test"
iter <- length(labs)
buttn <- 1
valLabs <- sapply(1:iter, function(i) {
if(is.null(input[[paste0(pages,"d",labs[i],buttn)]] )) {
          0
} else {  as.numeric(input[[paste0(pages,"d",labs[i],buttn)]])  }
}) 
#
toRender <- lapply(1:iter, function(i) {
  sliderInput(inputId = paste0(pages,"d",labs[i],buttn),
              label =  h6(paste0(labs[i],"")),
              min = -100,
              max = 100,
              step = 1,
              value = valLabs[i],
              post="%",
              ticks = FALSE, animate = FALSE)
              })
})
      return(toRender)

})
#--------------------
rds <- reactive({

if( is.null(input$demTb) ) return(iris_)

df_ <- hot_to_r(input$demTb)
isolate({

index <- which(df_$pick==T) 
if(length(index)==0) return(df_)
labs <- iris_$label[index] 
pages <- "test"
iter <- length(labs)
buttn <- 1
}) # end isolate
valLabs <- sapply(1:iter, function(i) {
    if(is.null(input[[paste0(pages,"d",labs[i],buttn)]] )) {
      0
    } else {  
      as.numeric(input[[paste0(pages,"d",labs[i],buttn)]])/100  
    }
  })

  dft_ <- data.frame(label=labs, multi=valLabs, stringsAsFactors = FALSE)
  dft_ <- merge(iris_,dft_,by="label", all.x=T)

  dft_$quantity <- sapply(1:length(dft_$quantity), function(z) {
    if( is.na( dft_$multi[z]) ) { 
    dft_$quantity[z]
  } else { iris_$quantity[z]*(1 + dft_$multi[z]) }
})
dft_[with(dft_,order(as.numeric(id))),]
df_[with(df_,order(as.numeric(id))),]

df_$quantity <- df_$quantity
  return(df_)
  }) 


output$demTb  <-  renderRHandsontable({


if(is.null(rds() )) return()

df_ <- rds() 
df_ <- df_[cols]
df_ <- df_[with(df_,order(as.numeric(id))),]
rhandsontable(df_, readOnly = FALSE, rowHeaders= NULL, useTypes= TRUE) %>%
  hot_table(highlightCol = TRUE, highlightRow = TRUE) %>%
hot_validate_numeric(col = "quantity", min = 0, max = 50, exclude = 40)


})

}

shinyApp(ui, server)

devtools::install_github(c('jeroenooms/jsonlite', 'rstudio/shiny', 'yihui/htmlwidgets@jsonlite'))