From 0b10738c1691eb6cd39beaca70f9fa374ad54ea4 Mon Sep 17 00:00:00 2001
From: Palapeli <26661008+mkwcat@users.noreply.github.com>
Date: Fri, 27 Dec 2024 19:23:02 -0500
Subject: [PATCH] QR2: Check if session is deleted in sendChallenge

---
 qr2/challenge.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/qr2/challenge.go b/qr2/challenge.go
index ad336c5..52940c9 100644
--- a/qr2/challenge.go
+++ b/qr2/challenge.go
@@ -33,7 +33,12 @@ func sendChallenge(conn net.PacketConn, addr net.UDPAddr, session Session, looku
 
 		challenge = common.RandomString(6) + "00" + hexIP + hexPort
 		mutex.Lock()
-		sessions[lookupAddr].Challenge = challenge
+		if sessionPtr := sessions[lookupAddr]; sessionPtr != nil {
+			sessionPtr.Challenge = challenge
+		} else {
+			mutex.Unlock()
+			return
+		}
 		mutex.Unlock()
 	}