Only plot when a Picture object is there

grConvert is not needed for plotting

1 files changed, 1 insertions, 0 deletions

diff --git a/R/chent.R b/R/chent.R
index 6a5abc7..c80cf06 100644
--- a/R/chent.R
+++ b/R/chent.R
@@ -463,6 +463,7 @@ draw_svg.chent = function(x, width = 300, height = 150,
 #' @example inst/examples/caffeine.R
 #' @export
 plot.chent = function(x, ...) {
+  if (is.null(x$Picture)) stop("No Picture object in chent, was RDKit available during creation?")
   grid.picture(x$Picture)
 }