From 8c1ba905a06cc6025eceb904364e0616fcdcf4d9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?=
 <marmarek@invisiblethingslab.com>
Date: Wed, 30 Aug 2017 12:52:21 +0200
Subject: [PATCH] api: do not fail events when listener is cancelled in the
 meantime

Raising any error from event handler will abort further handlers of this
event.
---
 qubes/api/__init__.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/qubes/api/__init__.py b/qubes/api/__init__.py
index 5e3df07c..b5e38175 100644
--- a/qubes/api/__init__.py
+++ b/qubes/api/__init__.py
@@ -325,6 +325,8 @@ class QubesDaemonProtocol(asyncio.Protocol):
             self.transport.write(content.encode('utf-8'))
 
     def send_event(self, subject, event, **kwargs):
+        if self.transport is None:
+            return
         self.event_sent = True
         self.send_header(0x31)