diff --git a/core/event.class.php b/core/event.class.php
index 0ce5b173..feba9976 100644
--- a/core/event.class.php
+++ b/core/event.class.php
@@ -83,11 +83,11 @@ class PageRequestEvent extends Event {
 	}
 	public function get_page_number() {
 		$page_number = 1;
-		if($event->count_args() == 1) {
-			$page_number = int_escape($event->get_arg(0));
+		if($this->count_args() == 1) {
+			$page_number = int_escape($this->get_arg(0));
 		}
-		else if($event->count_args() == 2) {
-			$page_number = int_escape($event->get_arg(1));
+		else if($this->count_args() == 2) {
+			$page_number = int_escape($this->get_arg(1));
 		}
 		if($page_number == 0) $page_number = 1; // invalid -> 0
 		return $page_number;