diff --git a/app/src/main/java/io/legado/app/base/adapter/DiffRecyclerAdapter.kt b/app/src/main/java/io/legado/app/base/adapter/DiffRecyclerAdapter.kt
index 9f9a69dc2..60d3600ed 100644
--- a/app/src/main/java/io/legado/app/base/adapter/DiffRecyclerAdapter.kt
+++ b/app/src/main/java/io/legado/app/base/adapter/DiffRecyclerAdapter.kt
@@ -26,8 +26,6 @@ abstract class DiffRecyclerAdapter<ITEM, VB : ViewBinding>(protected val context
         }
     }
 
-    private val lock = Object()
-
     private var itemClickListener: ((holder: ItemViewHolder, item: ITEM) -> Unit)? = null
     private var itemLongClickListener: ((holder: ItemViewHolder, item: ITEM) -> Boolean)? = null
 
diff --git a/app/src/main/java/io/legado/app/base/adapter/RecyclerAdapter.kt b/app/src/main/java/io/legado/app/base/adapter/RecyclerAdapter.kt
index 9815a6516..1f374acdf 100644
--- a/app/src/main/java/io/legado/app/base/adapter/RecyclerAdapter.kt
+++ b/app/src/main/java/io/legado/app/base/adapter/RecyclerAdapter.kt
@@ -26,8 +26,6 @@ abstract class RecyclerAdapter<ITEM, VB : ViewBinding>(protected val context: Co
 
     private val items: MutableList<ITEM> = mutableListOf()
 
-    private val lock = Object()
-
     private var itemClickListener: ((holder: ItemViewHolder, item: ITEM) -> Unit)? = null
     private var itemLongClickListener: ((holder: ItemViewHolder, item: ITEM) -> Boolean)? = null