diff --git a/start.php b/start.php
index e0279fb..25bb11b 100644
--- a/start.php
+++ b/start.php
@@ -14,7 +14,7 @@
     $length = ($_GET['length'] && gettype(+$_GET['length']) == 'integer') ? +$_GET['length'] : 10;
     $database = new Database();
     $questions_count = $database->query('SELECT COUNT(*) FROM "Questions"')['data'][0]['count'];
-    if($length = 0) {
+    if($length == 0) {
         $error = 12101;
     }
     if($length > $questions_count) {