diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index eb928d8c46..1892b04cab 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -198,13 +198,6 @@ jobs:
     - name: Install to Composer
       run: composer install --no-interaction -o
 
-    - name: Setup MailCatcher
-      run: gem install -N mailcatcher -v 0.6.5
-      shell: bash
-    - name: Run to MailCatcher
-      run: mailcatcher &
-      shell: bash
-
     - name: Setup to database
       run: |
         choco install -y mysql --version 5.7.18
diff --git a/data/class/pages/upgrade/helper/LC_Upgrade_Helper_Json.php b/data/class/pages/upgrade/helper/LC_Upgrade_Helper_Json.php
index 8eb64a914b..a01202c120 100644
--- a/data/class/pages/upgrade/helper/LC_Upgrade_Helper_Json.php
+++ b/data/class/pages/upgrade/helper/LC_Upgrade_Helper_Json.php
@@ -87,7 +87,7 @@ public function display()
      * そのため5.2.0以上の場合は組み込み関数のjson_decode()を使用する.
      *
      * @param  string   $str
-     * @return StdClass
+     * @return mixed
      * @see SC_Utils_Ex::jsonDecode
      */
     public function decode($str)
diff --git a/data/class/util/SC_Utils.php b/data/class/util/SC_Utils.php
index 212f88f6ee..e50f79b174 100755
--- a/data/class/util/SC_Utils.php
+++ b/data/class/util/SC_Utils.php
@@ -1896,7 +1896,7 @@ public static function copyDirectory($source_path, $dest_path)
             if (is_dir($cur_path)) {
                 // ディレクトリの場合
                 // コピー先に無いディレクトリの場合、ディレクトリ作成.
-                if (!empty($filename) && !file_exists($dest_file_path)) mkdir($dest_file_path);
+                if ($filename !== false && !file_exists($dest_file_path)) mkdir($dest_file_path);
                 SC_Utils_Ex::copyDirectory($cur_path . '/', $dest_file_path . '/');
             } else {
                 if (file_exists($dest_file_path)) unlink($dest_file_path);
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index b63e31e6fb..b8e705d855 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -30,14 +30,14 @@ parameters:
     -
       message: "#^Call to static method dayOfWeek\\(\\) on an unknown class Date_Calc\\.#"
       path: data/module/Calendar/Util/Textual.php
-    -
-      message: "#^Constant SMARTY_PLUGINS_DIR not found\\.$#"
-      path: data/smarty_extends/*
+    # -
+    #   message: "#^Constant SMARTY_PLUGINS_DIR not found\\.$#"
+    #   path: data/smarty_extends/*
     -
       message: "#^Function smarty_function_escape_special_chars not found\\.$#"
       path: data/smarty_extends/*
     -
-      message: "#^Variable \\$values in isset\\(\\) is always null\\.$#"
+      message: "#^Variable \\$values in isset\\(\\) always exists and is always null\\.$#"
       paths:
         - data/smarty_extends/function.html_radios_ex.php
         - data/smarty_extends/function.html_checkboxes_ex.php