1 files changed, 2 insertions, 4 deletions

diff --git a/js/RrdGraph.js b/js/RrdGraph.js
index 8794888..40d70da 100644
--- a/js/RrdGraph.js
+++ b/js/RrdGraph.js
@@ -1367,10 +1367,8 @@ RrdGraph.prototype.data_fetch_async_callback = function (args, ft_step)
                                 }
                 }
 
-                if (that.gdes[i].ds === -1) {
-                        alert("No DS called '"+that.gdes[i].ds_nam+"' in '"+that.gdes[i].rrd+"'");
-                        return;
-                }
+                if (that.gdes[i].ds === -1)
+                        throw new RrdGraphError("No DS called '"+that.gdes[i].ds_nam+"' in '"+that.gdes[i].rrd+"'");
         }
         that.graph_paint_draw();
 };