diff --git a/src/Issue/IssueService.php b/src/Issue/IssueService.php
index c7f302db..7436a7f7 100644
--- a/src/Issue/IssueService.php
+++ b/src/Issue/IssueService.php
@@ -143,7 +143,7 @@ public function addAttachments($issueIdOrKey, $filePathArray)
                     $ret, new \ArrayObject(), '\JiraRestApi\Issue\Attachment'
                     )
                 );
-            } else {
+            } elseif (is_object($ret)) {
                 array_push($resArr, $this->json_mapper->map(
                     $ret, new Attachment
                     )