From 0aad14afd1fdab600cb22338a3aa3f1012cda923 Mon Sep 17 00:00:00 2001
From: Matt Joiner <anacrolix@gmail.com>
Date: Thu, 15 Feb 2018 16:03:44 +1100
Subject: [PATCH] Add a check for a strange panic in production

---
 client.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/client.go b/client.go
index 6e8a7c20..55f89902 100644
--- a/client.go
+++ b/client.go
@@ -1099,6 +1099,9 @@ func (cl *Client) prepareTrackerAnnounceUnlocked(announceURL string) (blocked bo
 	if err != nil {
 		return
 	}
+	if addr.IP == nil {
+		panic(hmp.Host)
+	}
 	cl.mu.RLock()
 	_, blocked = cl.ipBlockRange(addr.IP)
 	cl.mu.RUnlock()