From 856a8d53cda34a93d6980bc4a5905281e7a8ce7c Mon Sep 17 00:00:00 2001
From: uael <uael@google.com>
Date: Mon, 6 Feb 2023 16:58:23 +0000
Subject: [PATCH] utils: fix possible invalide state error while canceling
 future for `abort_on`

---
 bumble/utils.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/bumble/utils.py b/bumble/utils.py
index 6f811f7d..111f0556 100644
--- a/bumble/utils.py
+++ b/bumble/utils.py
@@ -78,6 +78,8 @@ class AbortableEventEmitter(EventEmitter):
             return future
 
         def on_event(*_):
+            if future.done():
+                return
             msg = f'abort: {event} event occurred.'
             if isinstance(future, asyncio.Task):
                 # python < 3.9 does not support passing a message on `Task.cancel`