diff --git a/rd_ui/app/scripts/services/resources.js b/rd_ui/app/scripts/services/resources.js
index b7345731b7..621de4f583 100644
--- a/rd_ui/app/scripts/services/resources.js
+++ b/rd_ui/app/scripts/services/resources.js
@@ -150,8 +150,10 @@
             xValue = value;
             point[type] = value;
           }
-
           if (type == 'y') {
+            if (value == null) {
+              value = 0;
+            }
             yValues[name] = value;
             point[type] = value;
           }