diff --git a/core/frontend/src/components/canvas/customComponent/UserView.vue b/core/frontend/src/components/canvas/customComponent/UserView.vue
index 02a1dc53c3..ea6af2d3a5 100644
--- a/core/frontend/src/components/canvas/customComponent/UserView.vue
+++ b/core/frontend/src/components/canvas/customComponent/UserView.vue
@@ -1444,7 +1444,7 @@ export default {
       let mappingName = null
       if (this.chart.senior) {
         const senior = JSON.parse(this.chart.senior)
-        if (senior?.mapMapping[currentNode.code]) {
+        if (senior?.mapMapping?.[currentNode.code]) {
           const mapping = senior.mapMapping[currentNode.code]
           if (mapping[name]) {
             mappingName = mapping[name]