diff --git a/app/src/main/java/io/legado/app/data/entities/BookGroup.kt b/app/src/main/java/io/legado/app/data/entities/BookGroup.kt
index f97974cbbeb3..ac4b048b5722 100644
--- a/app/src/main/java/io/legado/app/data/entities/BookGroup.kt
+++ b/app/src/main/java/io/legado/app/data/entities/BookGroup.kt
@@ -9,12 +9,13 @@ import io.legado.app.R
 import io.legado.app.help.config.AppConfig
 import kotlinx.parcelize.Parcelize
 
+@Suppress("ConstPropertyName")
 @Parcelize
 @Entity(tableName = "book_groups")
 data class BookGroup(
     @PrimaryKey
     val groupId: Long = 0b1,
-    var groupName: String,
+    var groupName: String = "",
     var cover: String? = null,
     var order: Int = 0,
     @ColumnInfo(defaultValue = "1")
diff --git a/app/src/main/java/io/legado/app/model/ImageProvider.kt b/app/src/main/java/io/legado/app/model/ImageProvider.kt
index eb23262a3985..4cc0d8c4bc2d 100644
--- a/app/src/main/java/io/legado/app/model/ImageProvider.kt
+++ b/app/src/main/java/io/legado/app/model/ImageProvider.kt
@@ -40,7 +40,7 @@ object ImageProvider {
     private const val M = 1024 * 1024
     val cacheSize: Int
         get() {
-            if (AppConfig.bitmapCacheSize <= 0) {
+            if (AppConfig.bitmapCacheSize <= 0 || AppConfig.bitmapCacheSize >= 2048) {
                 AppConfig.bitmapCacheSize = 50
             }
             return AppConfig.bitmapCacheSize * M
diff --git a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeBookSourceDialog.kt b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeBookSourceDialog.kt
index 6366e0dc9a01..a51f563d2fdb 100644
--- a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeBookSourceDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeBookSourceDialog.kt
@@ -305,6 +305,7 @@ class ChangeBookSourceDialog() : BaseDialogFragment(R.layout.dialog_book_change_
 
     override fun changeTo(searchBook: SearchBook) {
         val oldBookType = callBack?.oldBook?.type?.and(BookType.updateError.inv())
+            ?.and(BookType.notShelf.inv())
         if (searchBook.type == oldBookType) {
             changeSource(searchBook) {
                 dismissAllowingStateLoss()
diff --git a/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
index 9a99cc27d7a5..f3e00314e94e 100644
--- a/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
@@ -124,7 +124,7 @@ class OtherConfigFragment : PreferenceFragment(),
             PreferKey.bitmapCacheSize -> {
                 NumberPickerDialog(requireContext())
                     .setTitle(getString(R.string.bitmap_cache_size))
-                    .setMaxValue(9999)
+                    .setMaxValue(2047)
                     .setMinValue(1)
                     .setValue(AppConfig.bitmapCacheSize)
                     .show {
diff --git a/app/src/main/java/io/legado/app/ui/rss/source/edit/RssSourceEditActivity.kt b/app/src/main/java/io/legado/app/ui/rss/source/edit/RssSourceEditActivity.kt
index 4e3c9cce7d39..2f0d00e45203 100644
--- a/app/src/main/java/io/legado/app/ui/rss/source/edit/RssSourceEditActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/rss/source/edit/RssSourceEditActivity.kt
@@ -23,7 +23,6 @@ import io.legado.app.ui.file.HandleFileContract
 import io.legado.app.ui.login.SourceLoginActivity
 import io.legado.app.ui.qrcode.QrCodeResult
 import io.legado.app.ui.rss.source.debug.RssSourceDebugActivity
-import io.legado.app.ui.widget.dialog.TextDialog
 import io.legado.app.ui.widget.dialog.UrlOptionDialog
 import io.legado.app.ui.widget.dialog.VariableDialog
 import io.legado.app.ui.widget.keyboard.KeyboardToolPop
diff --git a/app/src/main/java/io/legado/app/ui/widget/dialog/TextDialog.kt b/app/src/main/java/io/legado/app/ui/widget/dialog/TextDialog.kt
index 91859db1ab74..fd837b15f89d 100644
--- a/app/src/main/java/io/legado/app/ui/widget/dialog/TextDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/dialog/TextDialog.kt
@@ -77,7 +77,15 @@ class TextDialog() : BaseDialogFragment(R.layout.dialog_text_view) {
                 }
 
                 Mode.HTML.name -> binding.textView.setHtml(content)
-                else -> binding.textView.text = content
+                else -> {
+                    if (content.length >= 32 * 1024) {
+                        val truncatedContent =
+                            content.substring(0, 32 * 1024) + "\n\n数据太大，无法全部显示…"
+                        binding.textView.text = truncatedContent
+                    } else {
+                        binding.textView.text = content
+                    }
+                }
             }
             time = it.getLong("time", 0L)
         }