Grafana UI: Unbind graph only if initialised (#25762)

packages/grafana-ui/src/components/Graph/Graph.tsx

@@ -70,8 +70,10 @@ export class Graph extends PureComponent<GraphProps, GraphState> {
   }
   }
 
 
   componentWillUnmount() {
   componentWillUnmount() {
+    if (this.$element) {
       this.$element.unbind('plotselected', this.onPlotSelected);
       this.$element.unbind('plotselected', this.onPlotSelected);
     }
     }
+  }
 
 
   onPlotSelected = (event: JQueryEventObject, ranges: { xaxis: { from: number; to: number } }) => {
   onPlotSelected = (event: JQueryEventObject, ranges: { xaxis: { from: number; to: number } }) => {
     const { onHorizontalRegionSelected } = this.props;
     const { onHorizontalRegionSelected } = this.props;