diff --git a/src/FacebookAds/Logger/CurlLogger.php b/src/FacebookAds/Logger/CurlLogger.php
index 6c5052847..5f4292528 100644
--- a/src/FacebookAds/Logger/CurlLogger.php
+++ b/src/FacebookAds/Logger/CurlLogger.php
@@ -157,6 +157,7 @@ protected function processParams(Parameters $params, $method, $is_file) {
       if ($is_file && $params->offsetGet($name) instanceof FileParameter) {
         $value = "@" . $this->normalizeFileParam($params->offsetGet($name));
       } else {
+        $value = (string) $value;
         $value = addcslashes(
           strpos($value, "\n") !== false
             ? $this->indent($value, 2)