diff --git a/SessionMessagingKit/Sending & Receiving/MessageReceiver+Handling.swift b/SessionMessagingKit/Sending & Receiving/MessageReceiver+Handling.swift
index 6d4e1e71b..da2a573f7 100644
--- a/SessionMessagingKit/Sending & Receiving/MessageReceiver+Handling.swift	
+++ b/SessionMessagingKit/Sending & Receiving/MessageReceiver+Handling.swift	
@@ -269,6 +269,10 @@ extension MessageReceiver {
         }
         let group = thread.groupModel
         let oldMembers = group.groupMemberIds
+        // Check that the message isn't from before the group was created
+        guard Double(message.sentTimestamp!) > thread.creationDate.timeIntervalSince1970 else {
+            return SNLog("Ignoring closed group update from before thread was created.")
+        }
         // Check that the sender is a member of the group (before the update)
         guard Set(group.groupMemberIds).contains(message.sender!) else {
             return SNLog("Ignoring closed group update message from non-member.")