rewrite_url_if_needed: allow null referrer

1 files changed, 2 insertions, 2 deletions

diff --git a/init.php b/init.php
index 07abca4..bec0b59 100644
--- a/init.php
+++ b/init.php
@@ -285,7 +285,7 @@ class Api_Resize_Media extends Plugin {
 		}
 	}
 
-	private function rewrite_url_if_needed(string $url, int $width, string $referrer = "", bool $force_stamp = false) : string {
+	private function rewrite_url_if_needed(string $url, int $width, ?string $referrer = "", bool $force_stamp = false) : string {
 		$scheme = parse_url($url, PHP_URL_SCHEME) ?? "";
 
 		if ($width > 0 && !in_array($scheme, self::IGNORE_SCHEMES)) {
@@ -305,7 +305,7 @@ class Api_Resize_Media extends Plugin {
 
 				if ($this->cache->exists($flag)) {
 					return $this->host->get_public_method_url($this, "api_resize",
-						["url" => $url, "referrer" => $referrer, "width" => $width, "force_stamp" => $force_stamp]);
+						["url" => $url, "referrer" => $referrer ?? '', "width" => $width, "force_stamp" => $force_stamp]);
 				}
 			}
 		}