diff --git a/functions/functions.php b/functions/functions.php
index 8523ed2..01a1dd1 100644
--- a/functions/functions.php
+++ b/functions/functions.php
@@ -113,7 +113,7 @@ function get_year_production(mysqli $db, string $table, $date): array
 
 function get_last_value(mysqli $db, string $table, $date): float
 {
-    $value_query = 'SELECT last_value FROM ' . $table . ' WHERE date LIKE "' . $date . '%" ORDER BY date DESC LIMIT 1;';
+    $value_query = 'SELECT `last_value` FROM ' . $table . ' WHERE date LIKE "' . $date . '%" ORDER BY date DESC LIMIT 1;';
     $value_result = $db->query($value_query);
     $data = $value_result->fetch_assoc();