diff --git a/ember_debug/object-inspector.js b/ember_debug/object-inspector.js
index e50f0faaaf..88bcad8efa 100644
--- a/ember_debug/object-inspector.js
+++ b/ember_debug/object-inspector.js
@@ -1317,7 +1317,7 @@ function calculateCP(object, item, errorsForObject) {
     if (object instanceof Ember.ArrayProxy && property == parseInt(property)) {
       return object.objectAt(property);
     }
-    return item.isGetter || property.includes('.')
+    return item.isGetter || property.includes?.('.')
       ? object[property]
       : object.get?.(property) || object[property]; // need to use `get` to be able to detect tracked props
   } catch (error) {