diff --git a/composer.json b/composer.json
index 2cc3efd08..ddcd35028 100755
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
     }],
     "type": "project",
     "require": {
-        "php": ">=5.6.4",
+        "php": ">=7.1",
         "ext-curl": "*",
         "ext-dom": "*",
         "ext-fileinfo": "*",
@@ -29,7 +29,7 @@
         "ext-xsl": "*",
         "ext-zip": "*",
         "aluguest/ical-easy-reader": "^1.5",
-        "danielstjules/stringy": "^3.1",
+        "voku/stringy": "~6.0",
         "davidepastore/codice-fiscale": "^0.6.0",
         "dragonmantank/cron-expression": "^1.0",
         "ezyang/htmlpurifier": "^4.8",
diff --git a/core.php b/core.php
index 004664e5f..c22580eda 100755
--- a/core.php
+++ b/core.php
@@ -24,7 +24,7 @@ header_remove('X-Powered-By');
 date_default_timezone_set('Europe/Rome');
 
 // Controllo sulla versione PHP
-$minimum = '5.6.0';
+$minimum = '7.1.0';
 if (version_compare(phpversion(), $minimum) < 0) {
     echo '
 <p>Stai utilizzando la versione PHP '.phpversion().', non compatibile con OpenSTAManager.</p>
diff --git a/include/top.php b/include/top.php
index c917295c4..cf05f54bd 100755
--- a/include/top.php
+++ b/include/top.php
@@ -18,7 +18,7 @@
  */
 
 use Util\FileSystem;
-
+$lang = '';
 include_once __DIR__.'/../core.php';
 
 $paths = App::getPaths();
diff --git a/src/HTMLBuilder/HTMLBuilder.php b/src/HTMLBuilder/HTMLBuilder.php
index 027a8442f..8dfe92a60 100755
--- a/src/HTMLBuilder/HTMLBuilder.php
+++ b/src/HTMLBuilder/HTMLBuilder.php
@@ -485,7 +485,9 @@ class HTMLBuilder
         $attributes = [];
         foreach ($values as $key => $value) {
             // Fix per la presenza di apici doppi
-            $value = prepareToField(is_array($value) ? implode(' ', $value) : $value);
+            if (!empty($value)){
+                $value = prepareToField(is_array($value) ? implode(' ', $value) : $value);
+            }
             if (string_contains($result, '|'.$key.'|')) {
                 $result = str_replace('|'.$key.'|', $value, $result);
             } elseif (!empty($value) || is_numeric($value)) {