The NaN check should only use lastgdes when following a STACK -- Scott Mace <smace...

[rrdtool.git] / src / rrd_graph.c

diff --git a/src/rrd_graph.c b/src/rrd_graph.c
index 9e9cd8f..e1160f2 100644 (file)
--- a/src/rrd_graph.c
+++ b/src/rrd_graph.c
@@ -2399,7 +2399,7 @@ graph_paint(image_desc_t *im, char ***calcpr)
       /* make sure we do not run into trouble when stacking on NaN */
       for(ii=0;ii<im->xsize;ii++){
         if (isnan(im->gdes[i].p_data[ii])) {
-          if (lastgdes) {
+          if (lastgdes && (im->gdes[i].gf == GF_STACK)) {
             im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
           } else {
             im->gdes[i].p_data[ii] =  ytr(im,areazero);