diff --git a/inbox.py b/inbox.py
index f5ae165a..58a19ee2 100644
--- a/inbox.py
+++ b/inbox.py
@@ -2364,17 +2364,18 @@ def inboxAfterCapabilities(recentPostsCache: {}, maxRecentPosts: int,
                 if nickname != 'inbox':
                     # replies index will be updated
                     updateIndexList.append('tlreplies')
-                    inReplyTo = postJsonObject['object']['inReplyTo']
-                    if inReplyTo:
-                        if isinstance(inReplyTo, str):
-                            if not isMuted(baseDir, nickname, domain,
-                                           inReplyTo):
-                                replyNotify(baseDir, handle,
-                                            httpPrefix + '://' + domain +
-                                            '/users/' + nickname +
-                                            '/tlreplies')
-                            else:
-                                isReplyToMutedPost = True
+                    if postJsonObject['object'].get('inReplyTo'):
+                        inReplyTo = postJsonObject['object']['inReplyTo']
+                        if inReplyTo:
+                            if isinstance(inReplyTo, str):
+                                if not isMuted(baseDir, nickname, domain,
+                                            inReplyTo):
+                                    replyNotify(baseDir, handle,
+                                                httpPrefix + '://' + domain +
+                                                '/users/' + nickname +
+                                                '/tlreplies')
+                                else:
+                                    isReplyToMutedPost = True
 
             if isImageMedia(session, baseDir, httpPrefix,
                             nickname, domain, postJsonObject,