diff --git a/app/Http/Middleware/TeacherPortalAuthenticate.php b/app/Http/Middleware/TeacherPortalAuthenticate.php
index 193cf064..8974f9a0 100644
--- a/app/Http/Middleware/TeacherPortalAuthenticate.php
+++ b/app/Http/Middleware/TeacherPortalAuthenticate.php
@@ -22,7 +22,11 @@ class TeacherPortalAuthenticate
             return $next($request);
         }
 
-        $sanctumUser = Auth::guard('sanctum')->user();
+        try {
+            $sanctumUser = Auth::guard('sanctum')->user();
+        } catch (\InvalidArgumentException) {
+            $sanctumUser = null;
+        }
         if ($sanctumUser) {
             Auth::setUser($sanctumUser);