From 546d69c1296a5dffec4abdf7652547e94e9619bd Mon Sep 17 00:00:00 2001
From: Junzi Sun <junzisun@gmail.com>
Date: Sat, 16 Feb 2019 01:10:12 +0100
Subject: [PATCH] bug fix

---
 pyModeS/streamer/modeslive | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/pyModeS/streamer/modeslive b/pyModeS/streamer/modeslive
index 040f0ca..50bbd48 100755
--- a/pyModeS/streamer/modeslive
+++ b/pyModeS/streamer/modeslive
@@ -33,11 +33,13 @@ RAWTYPE = args.rawtype
 LAT0 = float(args.latlon[0])
 LON0 = float(args.latlon[1])
 UNCERTAINTY = args.uncertainty
-DUMPTO = os.getcwd() + '/' + args.dumpto
+DUMPTO = args.dumpto
 
-if not os.path.isdir(DUMPTO):
-    print('Error: dump folder (%s) does not exist' % DUMPTO)
-    sys.exit(1)
+if DUMPTO is not None:
+    DUMPTO = os.getcwd() + '/' + DUMPTO
+    if not os.path.isdir(DUMPTO):
+        print('Error: dump folder (%s) does not exist' % DUMPTO)
+        sys.exit(1)
 
 
 class ModesClient(BaseClient):