diff --git a/src/main/scala/com/nulabinc/backlog/c2b/App.scala b/src/main/scala/com/nulabinc/backlog/c2b/App.scala
index 2990a0c..14d0458 100644
--- a/src/main/scala/com/nulabinc/backlog/c2b/App.scala
+++ b/src/main/scala/com/nulabinc/backlog/c2b/App.scala
@@ -157,23 +157,22 @@ object App extends Logger {
   private def checkReleaseVersion(appVersion: String): AppProgram[Unit] =
     for {
       result <- AppDSL.fromHttp(HttpDSL.get(GithubRelease.url))
-      message <- result match {
+      _ <- result match {
         case Right(source) =>
           val latestVersion = GithubRelease.parseLatestVersion(source)
           if (latestVersion != appVersion) {
-            AppDSL.pure(s"""
+            val message = s"""
                |--------------------------------------------------
                |${Messages("warn.not_latest_version", latestVersion, appVersion)}
                |--------------------------------------------------
                |""".stripMargin
-            )
+            AppDSL.fromConsole(ConsoleDSL.printWarning(message))
           } else
-            AppDSL.pure("")
+            AppDSL.pure(())
         case Left(error) =>
           log.error(error.toString)
-          AppDSL.pure("")
+          AppDSL.pure(())
       }
-      _ <- AppDSL.fromConsole(ConsoleDSL.printWarning(message))
     } yield ()
 
   private def exit(exitCode: Int): Unit =
diff --git a/src/main/scala/com/nulabinc/backlog/c2b/interpreters/ConsoleInterpreter.scala b/src/main/scala/com/nulabinc/backlog/c2b/interpreters/ConsoleInterpreter.scala
index 6f86af0..398e0f2 100644
--- a/src/main/scala/com/nulabinc/backlog/c2b/interpreters/ConsoleInterpreter.scala
+++ b/src/main/scala/com/nulabinc/backlog/c2b/interpreters/ConsoleInterpreter.scala
@@ -12,16 +12,18 @@ class ConsoleInterpreter extends (ConsoleADT ~> Task) {
     program.foldMap(this)
 
   def print(string: String): Task[Unit] = Task {
-    ConsoleOut.println(string)
-    ()
+    if (string.nonEmpty)
+      ConsoleOut.println(string)
   }
 
   def printBold(string: String): Task[Unit] = Task {
-    ConsoleOut.boldln(string)
+    if (string.nonEmpty)
+      ConsoleOut.boldln(string)
   }
 
   def printWarning(string: String): Task[Unit] = Task {
-    ConsoleOut.warning(string)
+    if (string.nonEmpty)
+      ConsoleOut.warning(string)
   }
 
   def read(printMessage: String): Task[String] = Task {