diff --git a/asg_form/Controllers/InviteReferee.cs b/asg_form/Controllers/InviteReferee.cs
index eefb4a2..6fbcea3 100644
--- a/asg_form/Controllers/InviteReferee.cs
+++ b/asg_form/Controllers/InviteReferee.cs
@@ -71,7 +71,7 @@ namespace asg_form.Controllers
                 try
                 {
                     var invited = await userManager.Users.FirstOrDefaultAsync(u => u.Id == msg.invitedId);
-                    if (invited != null) return Ok(new { code = 404, message = "用户未找到" });
+                    if (invited == null) return Ok(new { code = 404, message = "用户未找到" });
                     var isInvited = await sb.T_Invitation.AnyAsync(i => i.user_id == userId && i.invited_id==msg.invitedId && i.match_id==msg.matchId);
                     if (!isInvited)
                     {