diff --git a/app/src/main/java/io/legado/app/ui/book/info/BookInfoActivity.kt b/app/src/main/java/io/legado/app/ui/book/info/BookInfoActivity.kt
index ce9a16923..d7743a4ac 100644
--- a/app/src/main/java/io/legado/app/ui/book/info/BookInfoActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/info/BookInfoActivity.kt
@@ -327,15 +327,11 @@ class BookInfoActivity :
                 }
                 customView { alertBinding.root }
                 okButton {
-                    launch(IO) {
-                        viewModel.bookSource?.setVariable(alertBinding.editView.text?.toString())
-                    }
+                    viewModel.bookSource?.setVariable(alertBinding.editView.text?.toString())
                 }
                 cancelButton()
                 neutralButton(R.string.delete) {
-                    launch(IO) {
-                        viewModel.bookSource?.setVariable(null)
-                    }
+                    viewModel.bookSource?.setVariable(null)
                 }
             }.show()
         }