diff --git a/.circleci/config.yml b/.circleci/config.yml
index b16d96368..d8fb4dc6c 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,7 +7,7 @@ jobs:
   build:
     docker:
       # specify the version you desire here
-      - image: circleci/openjdk:8u171-jdk
+      - image: circleci/openjdk:11.0.3-jdk-stretch-node-browsers-legacy
 
       # Specify service dependencies here if necessary
       # CircleCI maintains a library of pre-built images
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 6693a5074..894761f56 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -15,15 +15,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up JDK 1.8
-        uses: actions/setup-java@v1
+      - uses: actions/checkout@v3
+      - name: Set up JDK 11
+        uses: actions/setup-java@v3
         with:
-          java-version: 1.8
+          java-version: '11'
+          distribution: 'adopt'
+          architecture: x64
+          cache: maven
       - name: Build with Maven
-        run: mvn -B package --file pom.xml
-      - run: mkdir staging && cp target/*.jar staging
-      - uses: actions/upload-artifact@v2
-        with:
-          name: Package
-          path: staging
+        run: mvn --batch-mode --update-snapshots verify
\ No newline at end of file
diff --git a/src/main/java/dev/cosgy/JMusicBot/slashcommands/dj/PlaylistCmd.java b/src/main/java/dev/cosgy/JMusicBot/slashcommands/dj/PlaylistCmd.java
index 5eb82f401..26f09610d 100644
--- a/src/main/java/dev/cosgy/JMusicBot/slashcommands/dj/PlaylistCmd.java
+++ b/src/main/java/dev/cosgy/JMusicBot/slashcommands/dj/PlaylistCmd.java
@@ -82,18 +82,17 @@ public MakelistCmd(Bot bot) {
         @Override
         public void doCommand(CommandEvent event) {
 
-            String pname = event.getArgs().replaceAll("\\s+", "_");
+            String pName = event.getArgs().replaceAll("\\s+", "_");
             String guildId = event.getGuild().getId();
 
-            if (pname.isEmpty()) {
-                event.replyError("プレイリスト名を指定してください。");
-                return;
+            if(pName == null || pName.isEmpty())
+            {
+                event.replyError("プレイリストの名前を入力してください。");
             }
-
-            if (bot.getPlaylistLoader().getPlaylist(guildId, pname) == null) {
+            else if(bot.getPlaylistLoader().getPlaylist(guildId, pName) == null) {
                 try {
-                    bot.getPlaylistLoader().createPlaylist(guildId, pname);
-                    event.reply(event.getClient().getSuccess() + "再生リスト `" + pname + "` を作成しました");
+                    bot.getPlaylistLoader().createPlaylist(guildId, pName);
+                    event.reply(event.getClient().getSuccess() + "再生リスト `" + pName + "` を作成しました");
                 } catch (IOException e) {
                     if (event.isOwner() || event.getMember().isOwner()) {
                         event.replyError("曲の読み込み中にエラーが発生しました。\n" +
@@ -105,7 +104,7 @@ public void doCommand(CommandEvent event) {
                     event.reply(event.getClient().getError() + " 再生リストを作成できませんでした。:" + e.getLocalizedMessage());
                 }
             } else {
-                event.reply(event.getClient().getError() + " 再生リスト `" + pname + "` は既に存在します");
+                event.reply(event.getClient().getError() + " 再生リスト `" + pName + "` は既に存在します");
             }
         }
 
@@ -117,8 +116,10 @@ public void doCommand(SlashCommandEvent event) {
             }
             String pname = event.getOption("name").getAsString();
             String guildId = event.getGuild().getId();
-
-            if (bot.getPlaylistLoader().getPlaylist(guildId, pname) == null) {
+            if(pname == null || pname.isEmpty())
+            {
+                event.reply(client.getError() + "プレイリストの名前を入力してください。").queue();
+            } else if(bot.getPlaylistLoader().getPlaylist(guildId, pname) == null) {
                 try {
                     bot.getPlaylistLoader().createPlaylist(guildId, pname);
                     event.reply(client.getSuccess() + "再生リスト `" + pname + "` を作成しました").queue();