diff --git a/frontend/app/map/page.js b/frontend/app/map/page.js
index 443f3e0..30f650e 100644
--- a/frontend/app/map/page.js
+++ b/frontend/app/map/page.js
@@ -167,6 +167,7 @@ export default function MapPage() {
     setNodes([])
     setEdges([])
     setSelectedNode(null)
+    setChainIds(null)
     fetch(`${API}/programs/${selectedProgram}`)
       .then(r => r.json())
       .then(setCourseMap)