From 65825fe06e006ba24d877e8a5356a65049e0e034 Mon Sep 17 00:00:00 2001
From: Patrick Pacher <patrick.pacher@gmail.com>
Date: Wed, 18 Aug 2021 16:33:32 +0200
Subject: [PATCH] Fix panic when nobody waits for a geoip database

---
 intel/geoip/database.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/intel/geoip/database.go b/intel/geoip/database.go
index 5b0059a6..17ee2f13 100644
--- a/intel/geoip/database.go
+++ b/intel/geoip/database.go
@@ -67,6 +67,9 @@ func (ub *updateBroadcaster) ReplaceDatabase(db *geoIPDB) {
 // notifyWaiters notifies and removes all waiters. Must be called
 // with ub.rw locked.
 func (ub *updateBroadcaster) notifyWaiters() {
+	if ub.waiter == nil {
+		return
+	}
 	waiter := ub.waiter
 	ub.waiter = nil
 	close(waiter)