diff --git a/x-pack/plugins/endpoint/public/embeddables/resolver/view/process_event_dot.tsx b/x-pack/plugins/endpoint/public/embeddables/resolver/view/process_event_dot.tsx
index f30e5bb0f3578d..3b2647d70d1abd 100644
--- a/x-pack/plugins/endpoint/public/embeddables/resolver/view/process_event_dot.tsx
+++ b/x-pack/plugins/endpoint/public/embeddables/resolver/view/process_event_dot.tsx
@@ -164,7 +164,9 @@ export const ProcessEventDot = styled(
             preserveAspectRatio="xMidYMid meet"
             role="treeitem"
             aria-level={adjacentNodeMap.level}
-            aria-flowto={adjacentNodeMap.nextSibling}
+            aria-flowto={
+              adjacentNodeMap.nextSibling === null ? undefined : adjacentNodeMap.nextSibling
+            }
             aria-labelledby={labelId}
             aria-describedby={descriptionId}
             aria-haspopup={'true'}