ApexCharts: check for missing perspective state

src/client/components/facet_results/ApexCharts.js

@@ -59,7 +59,7 @@ class ApexChart extends React.Component {
       resultClass: this.state.resultClass,
       facetClass: this.props.facetClass,
       facetID: this.props.facetID,
-      uri: this.props.perspectiveState.instanceTableData
+      uri: this.props.perspectiveState && this.props.perspectiveState.instanceTableData
         ? this.props.perspectiveState.instanceTableData.id
         : null
     })