判空

public/react/src/context/EvaluateSuccessEffectDisplay.js

@@ -21,7 +21,7 @@ class EvaluateSuccessEffectDisplay extends Component {
     componentDidMount() {
         if (this.props.type == 'html') {
             const iframe = document.getElementById('_displayIframe')
-            if (iframe && iframe.contentWindow) {
+            if (iframe && iframe.contentWindow && this.props.iframe_src) {
                 iframe.contentWindow.open()
                 iframe.contentWindow.document.write(this.props.iframe_src);
                 iframe.contentWindow.document.close();