diff --git a/lib/kiss/kiss_serial.rb b/lib/kiss/kiss_serial.rb
index 81e39dbfc29e7c24922de1b23213b0ab1642bd6e..0d431edc6c2c1081660367eb9ab14c412d951603 100644
--- a/lib/kiss/kiss_serial.rb
+++ b/lib/kiss/kiss_serial.rb
@@ -31,8 +31,8 @@ module Kiss
         def read_interface
             read_data = @serial.read(@read_bytes)
             puts 'read_interface:'
-            p read_Date
             if read_data
+                p read_Date
                 return read_data.chars.map { |c| c.ord }
             else
                 return nil