diff --git a/app/src/main/java/io/legado/app/ui/book/explore/ExploreShowViewModel.kt b/app/src/main/java/io/legado/app/ui/book/explore/ExploreShowViewModel.kt
index cdaa0165e..734f343db 100644
--- a/app/src/main/java/io/legado/app/ui/book/explore/ExploreShowViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/explore/ExploreShowViewModel.kt
@@ -16,11 +16,12 @@ import io.legado.app.utils.stackTraceStr
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.mapLatest
+import java.util.Collections
 
 
 @OptIn(ExperimentalCoroutinesApi::class)
 class ExploreShowViewModel(application: Application) : BaseViewModel(application) {
-    val bookshelf = hashSetOf<String>()
+    val bookshelf: MutableSet<String> = Collections.synchronizedSet(hashSetOf<String>())
     val upAdapterLiveData = MutableLiveData<String>()
     val booksData = MutableLiveData<List<SearchBook>>()
     val errorLiveData = MutableLiveData<String>()
@@ -74,7 +75,7 @@ class ExploreShowViewModel(application: Application) : BaseViewModel(application
         val url = exploreUrl
         if (source == null || url == null) return emptyList()
         val searchBooks = arrayListOf<SearchBook>()
-        for (page in start .. end) {
+        for (page in start..end) {
             val books = WebBook.exploreBookAwait(source, url, page)
             if (books.isEmpty()) break
             searchBooks.addAll(books)
diff --git a/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt b/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt
index 390a5c74c..80609f2ad 100644
--- a/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt
@@ -16,11 +16,12 @@ import io.legado.app.utils.ConflateLiveData
 import io.legado.app.utils.toastOnUi
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.mapLatest
+import java.util.Collections
 
 @OptIn(ExperimentalCoroutinesApi::class)
 class SearchViewModel(application: Application) : BaseViewModel(application) {
     val handler = Handler(Looper.getMainLooper())
-    val bookshelf = hashSetOf<String>()
+    val bookshelf: MutableSet<String> = Collections.synchronizedSet(hashSetOf<String>())
     val upAdapterLiveData = MutableLiveData<String>()
     var searchBookLiveData = ConflateLiveData<List<SearchBook>>(1000)
     val searchScope: SearchScope = SearchScope(AppConfig.searchScope)