From 29d2e6b1b37e368c03217a2189dfc83f56d070a4 Mon Sep 17 00:00:00 2001
From: Koushik Dutta <koush@koushikdutta.com>
Date: Mon, 3 Feb 2020 15:52:37 -0800
Subject: [PATCH] Error.message is read only on some platforms.

This causes another Error to be thrown.
---
 lib/client/udp-tracker.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/client/udp-tracker.js b/lib/client/udp-tracker.js
index 2402dbf..d16427d 100644
--- a/lib/client/udp-tracker.js
+++ b/lib/client/udp-tracker.js
@@ -130,7 +130,11 @@ class UDPTracker extends Tracker {
       cleanup()
       if (self.destroyed) return
 
-      if (err.message) err.message += ` (${self.announceUrl})`
+      try {
+        // Error.message is readonly on some platforms.
+        if (err.message) err.message += ` (${self.announceUrl})`
+      } catch (ignored) {
+      }
       // errors will often happen if a tracker is offline, so don't treat it as fatal
       self.client.emit('warning', err)
     }