fix purchases.php

includes/functions.php

@@ -548,7 +548,11 @@ function format_datetime($datetime) {
  * @return string Prezzo formattato
  */
 function format_price($price) {
-    return '€ ' . number_format($price, 2, ',', '.');
+    // Gestisci null o valori non numerici
+    if ($price === null || $price === '') {
+        $price = 0;
+    }
+    return '€ ' . number_format((float)$price, 2, ',', '.');
 }
 
 /**