From d2279cc376bd657edbf8b534b9f9f9f2805f5acb Mon Sep 17 00:00:00 2001
From: Yasuhiro Inami <inamiy@gmail.com>
Date: Tue, 8 Oct 2019 21:31:59 +0900
Subject: [PATCH] Fix `KqueueSelector` crash

---
 Sources/KqueueSelector.swift | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Sources/KqueueSelector.swift b/Sources/KqueueSelector.swift
index e8d2817..2455078 100644
--- a/Sources/KqueueSelector.swift
+++ b/Sources/KqueueSelector.swift
@@ -167,7 +167,9 @@ public final class KqueueSelector: Selector {
             }
             fileDescriptorIOEvents[fileDescriptor] = ioEvents
         }
-        return Array(fileDescriptorIOEvents.map { (fileDescriptorMap[$0.0]!, $0.1) })
+        return Array(fileDescriptorIOEvents.compactMap { event in
+            fileDescriptorMap[event.0].map { ($0, event.1) } ?? nil
+        })
     }
 
     public subscript(fileDescriptor: Int32) -> SelectorKey? {