diff --git a/src/app/api/machines/session/route.ts b/src/app/api/machines/session/route.ts
index a89775f..7322de7 100644
--- a/src/app/api/machines/session/route.ts
+++ b/src/app/api/machines/session/route.ts
@@ -95,18 +95,13 @@ export async function GET(request: NextRequest) {
 
     if (!ensuredAssignedUserId && context.persona && context.assignedUserEmail) {
       try {
-        const ensureArgs: Record<string, unknown> = {
+        const ensuredUser = (await client.mutation(api.users.ensureUser, {
           tenantId: context.tenantId ?? DEFAULT_TENANT_ID,
           email: context.assignedUserEmail,
           name: context.assignedUserName ?? context.assignedUserEmail,
-          avatarUrl: undefined,
           role: (context.assignedUserRole ?? context.persona ?? "collaborator").toUpperCase(),
-        }
-        if (context.companyId) {
-          ensureArgs.companyId = context.companyId as Id<"companies">
-        }
-
-        const ensuredUser = (await client.mutation(api.users.ensureUser, ensureArgs)) as {
+          companyId: context.companyId ? (context.companyId as Id<"companies">) : undefined,
+        })) as {
           _id?: Id<"users">
           name?: string | null
           role?: string | null