Clearing the timeout

plugins/talk-plugin-permalink/client/components/PermalinkButton.js

@@ -48,7 +48,7 @@ export default class PermalinkButton extends React.Component {
       });
     }
 
-    setTimeout(() => {
+    this.timeout = window.setTimeout(() => {
       this.setState({
         copyFailure: null,
         copySuccessful: null
@@ -56,6 +56,10 @@ export default class PermalinkButton extends React.Component {
     }, 3000);
   }
 
+  componentWillUnmount() {
+    window.clearTimeout(this.timeout);
+  }
+
   render () {
     const {copySuccessful, copyFailure, popoverOpen} = this.state;
     const {asset} = this.props;