diff --git a/app/components/BatchResultEntry.tsx b/app/components/BatchResultEntry.tsx
index e147752..3bbffd0 100644
--- a/app/components/BatchResultEntry.tsx
+++ b/app/components/BatchResultEntry.tsx
@@ -307,7 +307,7 @@ export function BatchResultEntry({
                               size="sm"
                               className="h-8"
                               onClick={() => handleCreateParticipant(index)}
-                              disabled={!newParticipantName.trim()}
+                              disabled={!newParticipantName.trim() || createParticipantFetcher.state !== "idle"}
                             >
                               Add
                             </Button>