diff --git a/src/DigiSignClient.php b/src/DigiSignClient.php
index a8fa00f..80dad6b 100644
--- a/src/DigiSignClient.php
+++ b/src/DigiSignClient.php
@@ -138,7 +138,7 @@ private function createUri(string $uri, array $options): UriInterface
     {
         // replace uri parameters with its values
         preg_match_all('/{(\w+)}/', $uri, $matches);
-        $searches = $matches[1] ?? [];
+        $searches = $matches[1];
         $replaces = [];
 
         foreach ($searches as $search) {