From 436aee58734d05cfa0b8b6f39a7cf1d89ed4d24d Mon Sep 17 00:00:00 2001
From: Devon Hudson <devonhudson@librem.one>
Date: Thu, 14 Dec 2023 09:05:30 -0700
Subject: [PATCH] Check userID for nil to prevent panic

---
 eventauth.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/eventauth.go b/eventauth.go
index ee1fd24e..0610ac0e 100644
--- a/eventauth.go
+++ b/eventauth.go
@@ -526,7 +526,7 @@ func (a *allowerContext) powerLevelsEventAllowed(event PDU) error {
 		if err != nil {
 			return err
 		}
-		if !isValidUserID(sender.String()) {
+		if sender == nil || !isValidUserID(sender.String()) {
 			return errorf("Not a valid user ID: %q", senderID)
 		}
 	}