diff --git a/crawl.py b/crawl.py
index a89f906..6a240f0 100755
--- a/crawl.py
+++ b/crawl.py
@@ -230,4 +230,8 @@ elif args.csv:
     for rate in results.rates.values():
         w.writerow([rate.abbr, rate.full_name, rate.ask, rate.bid, rate.date])
 else:
-    print(fmt_and_calc(args.amt, args.currency, results, direction))
+    if args.amt and args.currency:
+        print(fmt_and_calc(args.amt, args.currency, results, direction))
+    else:
+        print("Missing arguments. Exiting", file=sys.stderr)
+        exit(1)