diff --git a/src/activitypub/mocks.js b/src/activitypub/mocks.js
index 493655c272..003d392333 100644
--- a/src/activitypub/mocks.js
+++ b/src/activitypub/mocks.js
@@ -190,7 +190,7 @@ Mocks.post = async (objects) => {
 		}
 
 		switch (true) {
-			case image && image.hasOwnProperty('url') && image.url: {
+			case image && image.hasOwnProperty('url') && !!image.url: {
 				image = image.url;
 				break;
 			}