diff --git a/inc/class-infinite-uploads-api-handler.php b/inc/class-infinite-uploads-api-handler.php
index be89493..97aaab2 100644
--- a/inc/class-infinite-uploads-api-handler.php
+++ b/inc/class-infinite-uploads-api-handler.php
@@ -273,7 +273,7 @@ public function call( $remote_path, $data = [], $method = 'GET', $options = [] )
 		}
 
 		if ( 200 != wp_remote_retrieve_response_code( $response ) ) {
-			if ( empty( $options['blocking'] ) ) {
+			if ( ! isset( $options['blocking'] ) || false !== $options['blocking'] ) {
 				$this->parse_api_error( $response );
 			}