diff --git a/pySim-read.py b/pySim-read.py
index f901260..7906685 100755
--- a/pySim-read.py
+++ b/pySim-read.py
@@ -82,6 +82,8 @@
 
 	# Init card reader driver
 	sl = init_reader(opts)
+	if sl is None:
+		exit(1)
 
 	# Create command layer
 	scc = SimCardCommands(transport=sl)