From b5c9a706cec60274e6df17a1c1bc61f5f3dc82c7 Mon Sep 17 00:00:00 2001
From: Wolfgang Bumiller <w.bumiller@proxmox.com>
Date: Fri, 13 Dec 2019 12:10:04 +0100
Subject: [PATCH] fix cancellable future

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
---
 src/tools/futures.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/tools/futures.rs b/src/tools/futures.rs
index 30d7b7cf..893fd28d 100644
--- a/src/tools/futures.rs
+++ b/src/tools/futures.rs
@@ -61,7 +61,9 @@ impl Canceller {
     ///
     /// This does nothing if the future already finished successfully.
     pub fn cancel(&self) {
-        let _ = self.0.lock().unwrap().take().unwrap().send(());
+        if let Some(sender) = self.0.lock().unwrap().take() {
+            let _ = sender.send(());
+        }
     }
 }