diff --git a/Lexical/Core/Editor.swift b/Lexical/Core/Editor.swift
index 9291573..477b3e0 100644
--- a/Lexical/Core/Editor.swift
+++ b/Lexical/Core/Editor.swift
@@ -230,7 +230,7 @@ public class Editor: NSObject {
 
     return { [weak self] in
       guard let self else { return }
-      self.listeners.update.removeValue(forKey: uuid)
+      self.listeners.errors.removeValue(forKey: uuid)
     }
   }
 
diff --git a/Lexical/Core/Reconciler.swift b/Lexical/Core/Reconciler.swift
index fc75def..2890926 100644
--- a/Lexical/Core/Reconciler.swift
+++ b/Lexical/Core/Reconciler.swift
@@ -467,8 +467,8 @@ internal enum Reconciler {
           nextChildrenSet = Set(nextChildren)
         }
 
-        let nextHasPrevKey = nextChildren.contains(prevKey)
-        let prevHasNextKey = prevChildren.contains(nextKey)
+        let nextHasPrevKey = nextChildrenSet!.contains(prevKey)
+        let prevHasNextKey = prevChildrenSet!.contains(nextKey)
 
         if !nextHasPrevKey {
           // Remove prev