diff --git a/superset/assets/javascripts/explorev2/components/ChartContainer.jsx b/superset/assets/javascripts/explorev2/components/ChartContainer.jsx
index 00932a07c5..bd944b852b 100644
--- a/superset/assets/javascripts/explorev2/components/ChartContainer.jsx
+++ b/superset/assets/javascripts/explorev2/components/ChartContainer.jsx
@@ -109,16 +109,17 @@ class ChartContainer extends React.Component {
       },
 
       clearError: () => {
-        this.props.actions.removeChartAlert();
+        // no need to do anything here since Alert is closable
+        // query button will also remove Alert
       },
 
       error(msg) {
-        this.props.actions.chartUpdateFailed(msg);
+        props.actions.chartUpdateFailed(msg);
       },
 
       d3format: (col, number) => {
         // mock d3format function in Slice object in superset.js
-        const format = this.props.column_formats[col];
+        const format = props.column_formats[col];
         return d3format(format, number);
       },
     };
diff --git a/superset/assets/visualizations/nvd3_vis.js b/superset/assets/visualizations/nvd3_vis.js
index adc5fef35f..dfa1abcdb8 100644
--- a/superset/assets/visualizations/nvd3_vis.js
+++ b/superset/assets/visualizations/nvd3_vis.js
@@ -60,6 +60,7 @@ function nvd3Vis(slice) {
 
   const render = function () {
     d3.json(slice.jsonEndpoint(), function (error, payload) {
+      slice.container.html('');
       // Check error first, otherwise payload can be null
       if (error) {
         slice.error(error.responseText, error);