diff --git a/mobile/src/main/java/com/github/shadowsocks/acl/CustomRulesFragment.kt b/mobile/src/main/java/com/github/shadowsocks/acl/CustomRulesFragment.kt
index c32ce3a9..631c9ebe 100644
--- a/mobile/src/main/java/com/github/shadowsocks/acl/CustomRulesFragment.kt
+++ b/mobile/src/main/java/com/github/shadowsocks/acl/CustomRulesFragment.kt
@@ -459,6 +459,7 @@ class CustomRulesFragment : ToolbarFragment(), Toolbar.OnMenuItemClickListener,
 
     override fun onDetach() {
         undoManager.flush()
+        mode?.finish()
         super.onDetach()
     }