1 files changed, 1 insertions, 1 deletions
diff --git a/lib/webrick/server.rb b/lib/webrick/server.rb
index 30f4dc3143..c6d1e4f0f9 100644
--- a/lib/webrick/server.rb
+++ b/lib/webrick/server.rb
@@ -204,7 +204,7 @@ module WEBrick
           else
             @logger.debug "close: <address unknown>"
           end
-          sock.close
+          sock.close unless sock.closed?
         end
       }
     end