diff --git a/src/utils/invitation-utils.ts b/src/utils/invitation-utils.ts
index 3706352..d9ca6f3 100644
--- a/src/utils/invitation-utils.ts
+++ b/src/utils/invitation-utils.ts
@@ -7,7 +7,7 @@
  */
 
 import type { Invitation } from "../services/invitation.js";
-import type { XOTemplate } from "@xo-cash/types";
+import type { XOInvitationCommit, XOTemplate } from "@xo-cash/types";
 
 /**
  * Color names for invitation states.
@@ -249,9 +249,9 @@ export function formatInvitationId(id: string, maxLength: number = 16): string {
  * @param invitation - The invitation to check
  * @returns Array of unique entity identifiers
  */
-export function getInvitationParticipants(invitation: Invitation): string[] {
+export function getInvitationParticipants(commits: Array<XOInvitationCommit>): string[] {
   const participants = new Set<string>();
-  for (const commit of invitation.data.commits || []) {
+  for (const commit of commits) {
     if (commit.entityIdentifier) {
       participants.add(commit.entityIdentifier);
     }
@@ -267,9 +267,14 @@ export function getInvitationParticipants(invitation: Invitation): string[] {
  * @returns True if the user has made at least one commit
  */
 export function isUserParticipant(
-  invitation: Invitation,
+  invitation: Invitation | Array<XOInvitationCommit>,
   userEntityId: string | null,
 ): boolean {
   if (!userEntityId) return false;
-  return getInvitationParticipants(invitation).includes(userEntityId);
+
+  if (Array.isArray(invitation)) {
+    return invitation.some(commit => commit.entityIdentifier === userEntityId);
+  }
+
+  return getInvitationParticipants(invitation.data.commits).includes(userEntityId);
 }