diff --git a/.scrutinizer.yml b/.scrutinizer.yml
index d66f5cdc6..f78f0bbea 100644
--- a/.scrutinizer.yml
+++ b/.scrutinizer.yml
@@ -116,6 +116,12 @@ tools:
     # Runs Scrutinizer's PHP Analyzer Tool
     php_analyzer:
         enabled:              true
+        checks:
+            php:
+                function_in_camel_caps: false
+                no_underscore_prefix_in_methods: false
+                no_underscore_prefix_in_properties: false
+                one_class_per_file: false
         filter:
             excluded_paths:
                 - 'docs/*'
diff --git a/class.phpmailer.php b/class.phpmailer.php
index a25cddd98..404dc8cf6 100644
--- a/class.phpmailer.php
+++ b/class.phpmailer.php
@@ -2932,7 +2932,7 @@ public function msgHTML($message, $basedir = '', $advanced = false)
                         $cid,
                         $filename,
                         'base64',
-                        self::_mime_types(self::mb_pathinfo($filename, PATHINFO_EXTENSION))
+                        self::_mime_types((string)self::mb_pathinfo($filename, PATHINFO_EXTENSION))
                     )
                     ) {
                         $message = preg_replace(