From 3bcd5a8e837d90da7140635c1e58209877cceb3d Mon Sep 17 00:00:00 2001
From: ycdesu <sychewo@gmail.com>
Date: Sat, 27 Mar 2021 09:54:12 +0800
Subject: [PATCH] ftx: null guard in close

---
 pkg/exchange/ftx/stream.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkg/exchange/ftx/stream.go b/pkg/exchange/ftx/stream.go
index dd4fb8d2d..8da44f6d9 100644
--- a/pkg/exchange/ftx/stream.go
+++ b/pkg/exchange/ftx/stream.go
@@ -41,5 +41,8 @@ func (s *Stream) Subscribe(channel types.Channel, symbol string, _ types.Subscri
 	}
 }
 func (s *Stream) Close() error {
-	return s.wsService.Close()
+	if s.wsService != nil {
+		return s.wsService.Close()
+	}
+	return nil
 }