diff --git a/src/main/java/info/istlab/IoTP/ScriptRunner.java b/src/main/java/info/istlab/IoTP/ScriptRunner.java
index 782b4d8..ab89b69 100644
--- a/src/main/java/info/istlab/IoTP/ScriptRunner.java
+++ b/src/main/java/info/istlab/IoTP/ScriptRunner.java
@@ -50,7 +50,8 @@
             comlist.add("Upload.bat");
             if (srcfile.length() > 0)
                 comlist.add(srcfile);
-            comlist.add(App.serialName);
+            if (App.serialName != null)
+                comlist.add(App.serialName);
         } else {
             comlist.add("bash");
             comlist.add("Upload.sh");
@@ -69,7 +70,7 @@
         // con.Systemoutprintln(CommandRunner.prompt+"cd ~" + App.nwpsrc+" (注：~ はチルダ記号〜
         // で，ホームディレクトリを表します)");
         // for (String s : comlist) {
-        //     con.Systemoutprintln(s);
+        // con.Systemoutprintln(s);
         // }
         // Map<String, String> envs = processBuilder.environment();
         // System.out.println(envs.get("Path"));