diff --git a/src/classes/Callbacks.coffee b/src/classes/Callbacks.coffee
index fbe225284..797bd6129 100644
--- a/src/classes/Callbacks.coffee
+++ b/src/classes/Callbacks.coffee
@@ -11,6 +11,8 @@ class Callbacks
     @[name] = cb
 
   execute: (node, keys=@keys) ->
+    return if node.callbacksExecuted
+    node.callbacksExecuted = true
     for name in keys
       try
         @[name]?.call node
diff --git a/src/classes/Post.coffee b/src/classes/Post.coffee
index b143c47e9..7a8a13fe7 100644
--- a/src/classes/Post.coffee
+++ b/src/classes/Post.coffee
@@ -275,6 +275,8 @@ class Post
     @board.posts.rm @
 
   addClone: (context, contractThumb) ->
+    # Callbacks may not have been run yet due to anti-browser-lock delay in Main.callbackNodesDB.
+    Callbacks.Post.execute @
     new Post.Clone @, context, contractThumb
 
   rmClone: (index) ->