diff --git a/docker-compose.yml b/docker-compose.yml
index 31ab15f..8f6d016 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -9,6 +9,9 @@ services:
       - ./www:/var/www/html
       - ./docker-nginx-conf/default.conf:/etc/nginx/conf.d/default.conf
   php-fpm:
-    image: php:8-fpm
+    image: php:development
+    build:
+      context: .
+      dockerfile: php.Dockerfile
     volumes:
       - ./www:/var/www/html
diff --git a/php.Dockerfile b/php.Dockerfile
new file mode 100644
index 0000000..4952a2b
--- /dev/null
+++ b/php.Dockerfile
@@ -0,0 +1,4 @@
+FROM php:8-fpm
+
+# Use the default production configuration
+RUN mv "$PHP_INI_DIR/php.ini-development" "$PHP_INI_DIR/php.ini"
diff --git a/www/index.php b/www/index.php
index 6e65d1e..6e1bbeb 100644
--- a/www/index.php
+++ b/www/index.php
@@ -401,7 +401,7 @@ function prepareContent( $file, $sourcePath )
   $content = file_get_contents( $file );
 
   foreach ( $LOADER['ARCHIVARIX_INCLUDE_CUSTOM'] as $includeCustom ) {
-    if ( $includeCustom['FILE'] && $includeCustom['KEYPHRASE'] ) {
+    if ( isset($includeCustom['FILE']) && $includeCustom['FILE'] && isset($includeCustom['KEYPHRASE']) && $includeCustom['KEYPHRASE'] ) {
       global $includeRule;
       $includeRule = $includeCustom;
       ob_start();
@@ -424,9 +424,9 @@ function prepareContent( $file, $sourcePath )
       }
 
       $content = preg_replace( '~' . $includeCustom['KEYPHRASE'] . '~is', $includedContent, $content, $includeCustom['LIMIT'] );
-    } else if ( $includeCustom['OPERATION'] && $includeCustom['XPATH'] ) {
+    } else if ( isset($includeCustom['OPERATION']) && $includeCustom['OPERATION'] && isset($includeCustom['XPATH']) && $includeCustom['XPATH'] ) {
       $doc = new DOMDocument();
-      $doc->loadHTML($content);
+      $doc->loadHTML($content, LIBXML_NOERROR);
       $xpath = new DOMXpath($doc);
       $elementsToChange = $xpath->query($includeCustom['XPATH']);