diff --git a/public/changelog.php b/public/changelog.php
index 752b6ea8..ce9152af 100644
--- a/public/changelog.php
+++ b/public/changelog.php
@@ -3,10 +3,10 @@ use Misuzu\Request\RequestVar;
 
 require_once '../misuzu.php';
 
-$changelogChange = RequestVar::get()->select('c')->int();
-$changelogDate = RequestVar::get()->select('d')->string();
-$changelogUser = RequestVar::get()->select('u')->int();
-$changelogTags = RequestVar::get()->select('t')->string();
+$changelogChange = RequestVar::get()->select('c')->int(0);
+$changelogDate = RequestVar::get()->select('d')->string('');
+$changelogUser = RequestVar::get()->select('u')->int(0);
+$changelogTags = RequestVar::get()->select('t')->string('');
 
 tpl_var('comments_perms', $commentPerms = comments_get_perms(user_session_current('user_id', 0)));
 
diff --git a/src/Request/RequestVar.php b/src/Request/RequestVar.php
index c1e3e1f2..9897261a 100644
--- a/src/Request/RequestVar.php
+++ b/src/Request/RequestVar.php
@@ -3,7 +3,7 @@ namespace Misuzu\Request;
 
 class RequestVar
 {
-    private $value;
+    private $value = null;
     private $valueCasted = null;
     private $type;
 
@@ -90,17 +90,17 @@ class RequestVar
 
     public function int(?int $default = null): ?int
     {
-        return (int)$this->value == $this->value ? (int)$this->value : $default;
+        return empty($this->value) ? $default : (int)$this->value;
     }
 
     public function bool(?bool $default = null): bool
     {
-        return (bool)$this->value == $this->value ? (bool)$this->value : $default;
+        return empty($this->value) ? $default : (bool)$this->value;
     }
 
     public function float(?float $default = null): float
     {
-        return (float)$this->value == $this->value ? (float)$this->value : $default;
+        return empty($this->value) ? $default : (float)$this->value;
     }
 
     // avoid using when possible