diff --git a/lib/timeline/component/LineGraph.js b/lib/timeline/component/LineGraph.js
index 9d55bdee..53b85db1 100644
--- a/lib/timeline/component/LineGraph.js
+++ b/lib/timeline/component/LineGraph.js
@@ -191,7 +191,7 @@ LineGraph.prototype.setOptions = function(options) {
       this.autoSizeSVG = true;
     }
     else if (this.body.domProps.centerContainer.height !== undefined && options.graphHeight !== undefined) {
-      if (parseInt(options.graphHeight.replace("px",'')) < this.body.domProps.centerContainer.height) {
+      if (parseInt((options.graphHeight + '').replace("px",'')) < this.body.domProps.centerContainer.height) {
         this.autoSizeSVG = true;
       }
     }