diff --git a/modules/primanota/actions.php b/modules/primanota/actions.php
index 3981c300e..974866812 100644
--- a/modules/primanota/actions.php
+++ b/modules/primanota/actions.php
@@ -26,7 +26,7 @@ switch (post('op')) {
             $avere = $post['avere'][$i];
 
             if (!empty($dare) || !empty($avere)) {
-                if (is_float($avere)) {
+                if (!empty($avere)) {
                     $totale = -$avere;
                 } else {
                     $totale = $dare;
diff --git a/src/HTMLBuilder/HTMLBuilder.php b/src/HTMLBuilder/HTMLBuilder.php
index 2baa4b958..ae0ba9882 100644
--- a/src/HTMLBuilder/HTMLBuilder.php
+++ b/src/HTMLBuilder/HTMLBuilder.php
@@ -94,14 +94,18 @@ class HTMLBuilder
             $json = self::decode($value, 'manager');
             $class = self::getManager($json['name']);
 
-            $html = str_replace($value, !empty($class) ? $class->manage($json) : '', $html);
+            $result = !empty($class) ? $class->manage($json) : '';
+
+            $html = str_replace($value, !empty($result) ? $result : $value, $html);
         }
 
         preg_match_all('/'.preg_quote(self::$open['handler']).'(.+?)'.preg_quote(self::$close['handler']).'/is', $html, $handlers);
 
         foreach ($handlers[0] as $value) {
             $json = self::decode($value, 'handler');
-            $html = str_replace($value, self::generate($json), $html);
+            $result = self::generate($json);
+
+            $html = str_replace($value, !empty($result) ? $result : $value, $html);
         }
 
         return $html;
@@ -396,15 +400,3 @@ class HTMLBuilder
         }
     }
 }
-
-/**
- * Predispone un testo per l'inserimento all'interno di un attributo HTML.
- *
- * @param string $string
- *
- * @return string
- */
-function prepareToField($string)
-{
-    return str_replace('"', '"', $string);
-}
diff --git a/src/Intl/Formatter.php b/src/Intl/Formatter.php
index fc4bbe9f2..65adc8e4d 100644
--- a/src/Intl/Formatter.php
+++ b/src/Intl/Formatter.php
@@ -178,7 +178,7 @@ class Formatter
     {
         $result = $this->formatNumber($value);
 
-        return !empty($result);
+        return !is_bool($result);
     }
 
     /**
@@ -192,7 +192,7 @@ class Formatter
     {
         $result = $this->parseNumber($value);
 
-        return !empty($result);
+        return !is_bool($result);
     }
 
     /**
@@ -343,7 +343,7 @@ class Formatter
     {
         $result = $this->formatTimestamp($value);
 
-        return !empty($result);
+        return !is_bool($result);
     }
 
     /**
@@ -357,7 +357,7 @@ class Formatter
     {
         $result = $this->parseTimestamp($value);
 
-        return !empty($result);
+        return !is_bool($result);
     }
 
     /**
@@ -427,7 +427,7 @@ class Formatter
     {
         $result = $this->formatDate($value);
 
-        return !empty($result);
+        return !is_bool($result);
     }
 
     /**
@@ -441,7 +441,7 @@ class Formatter
     {
         $result = $this->parseDate($value);
 
-        return !empty($result);
+        return !is_bool($result);
     }
 
     /**
@@ -511,7 +511,7 @@ class Formatter
     {
         $result = $this->formatTime($value);
 
-        return !empty($result);
+        return !is_bool($result);
     }
 
     /**
@@ -525,7 +525,7 @@ class Formatter
     {
         $result = $this->parseTime($value);
 
-        return !empty($result);
+        return !is_bool($result);
     }
 
     /**