diff --git a/tools/check_radio_versions.py b/tools/check_radio_versions.py
index 83d3ab2..ebe621f 100755
--- a/tools/check_radio_versions.py
+++ b/tools/check_radio_versions.py
@@ -22,6 +22,9 @@
 except ImportError:
   from sha import sha as sha1
 
+if len(sys.argv) < 2:
+  sys.exit(0)
+
 build_info = {}
 f = open(sys.argv[1])
 for line in f: