diff --git a/src/API.php b/src/API.php
index 73d7968..b806312 100644
--- a/src/API.php
+++ b/src/API.php
@@ -12,6 +12,9 @@ class API {
 	}
 
 	public function convertResponse(mixed $res): array {
+		if ($res === null) {
+			$res = ["error" => "invalid_endpoint"];
+		}
 		if (is_bool($res)) {
 			$res = ["success" => $res];
 		}
@@ -33,7 +36,7 @@ class API {
 
 	function getClass(array $path): string | null {
 		$root = &$this->map;
-		foreach ($path as $part) {
+		foreach ($path as &$part) {
 			if (!array_key_exists($part, $root)) return null;
 			$root = &$root[$part];
 		}
@@ -55,9 +58,9 @@ class API {
 		return explode("/", $action);
 	}
 
-	function execute(array $path, array $data) {
+	function execute(array $path, array $data): mixed {
 		$class = $this->getClass($path);
-		if ($class == null) return ["error" => "invalid_endpoint"];
+		if ($class == null) return null;
 		$endpoint = $this->getEndpoint($class);
 		return $endpoint->get($data);
 	}