diff --git a/mcserver-manager/src/main/resources/components.js b/mcserver-manager/src/main/resources/components.js
index 8b6cc4d..a8dc8c9 100644
--- a/mcserver-manager/src/main/resources/components.js
+++ b/mcserver-manager/src/main/resources/components.js
@@ -32,7 +32,9 @@ var NvLineChart = React.createClass({
     },
     componentWillUnmount: function() {
         var nvtooltip = document.querySelector('div[class~="nvtooltip"]');
-        nvtooltip.parentElement.removeChild(nvtooltip)
+        if (nvtooltip !== null) {
+            nvtooltip.parentElement.removeChild(nvtooltip)
+        }
     }
 });