diff --git a/app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt b/app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt
index 0b05c7778..a88f2fb1f 100644
--- a/app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt
@@ -275,7 +275,7 @@ class BookInfoViewModel(application: Application) : BaseViewModel(application) {
 
     fun deCompress(archiveFileUri: Uri, onSuccess: (List<FileDoc>) -> Unit) {
         execute {
-            ArchiveUtils.deCompress(archiveFileUri, defaultBookTreeUri).list {
+            ArchiveUtils.deCompress(archiveFileUri, defaultBookTreeUri!!).list {
                 AppPattern.bookFileRegex.matches(it.name)
             } ?: emptyList()
         }.onError {