diff --git a/app/src/main/java/io/legado/app/help/storage/ImportOldData.kt b/app/src/main/java/io/legado/app/help/storage/ImportOldData.kt
index 1cf361213..0c79c280d 100644
--- a/app/src/main/java/io/legado/app/help/storage/ImportOldData.kt
+++ b/app/src/main/java/io/legado/app/help/storage/ImportOldData.kt
@@ -16,7 +16,7 @@ object ImportOldData {
                 when (doc.name) {
                     "myBookShelf.json" ->
                         kotlin.runCatching {
-                            DocumentUtils.readText(context, doc.uri)?.let { json ->
+                            DocumentUtils.readText(context, doc.uri).let { json ->
                                 val importCount = importOldBookshelf(json)
                                 context.toastOnUi("成功导入书籍${importCount}")
                             }
@@ -25,7 +25,7 @@ object ImportOldData {
                         }
                     "myBookSource.json" ->
                         kotlin.runCatching {
-                            DocumentUtils.readText(context, doc.uri)?.let { json ->
+                            DocumentUtils.readText(context, doc.uri).let { json ->
                                 val importCount = importOldSource(json)
                                 context.toastOnUi("成功导入书源${importCount}")
                             }
@@ -34,7 +34,7 @@ object ImportOldData {
                         }
                     "myBookReplaceRule.json" ->
                         kotlin.runCatching {
-                            DocumentUtils.readText(context, doc.uri)?.let { json ->
+                            DocumentUtils.readText(context, doc.uri).let { json ->
                                 val importCount = importOldReplaceRule(json)
                                 context.toastOnUi("成功导入替换规则${importCount}")
                             }
diff --git a/app/src/main/java/io/legado/app/help/storage/Restore.kt b/app/src/main/java/io/legado/app/help/storage/Restore.kt
index 8baee57e8..46a171ab1 100644
--- a/app/src/main/java/io/legado/app/help/storage/Restore.kt
+++ b/app/src/main/java/io/legado/app/help/storage/Restore.kt
@@ -72,7 +72,7 @@ object Restore {
                 DocumentFile.fromTreeUri(context, Uri.parse(path))?.listFiles()?.forEach { doc ->
                     for (fileName in Backup.backupFileNames) {
                         if (doc.name == fileName) {
-                            DocumentUtils.readText(context, doc.uri)?.let {
+                            DocumentUtils.readText(context, doc.uri).let {
                                 FileUtils.createFileIfNotExist("${Backup.backupPath}${File.separator}$fileName")
                                     .writeText(it)
                             }
diff --git a/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt b/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt
index 6400267c1..265e019d5 100644
--- a/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt
+++ b/app/src/main/java/io/legado/app/model/localBook/LocalBook.kt
@@ -67,7 +67,7 @@ object LocalBook {
                 val bookFile = cacheFolder.getFile(it.name!!)
                 if (!bookFile.exists()) {
                     bookFile.createNewFile()
-                    doc.readBytes(appCtx)?.let { bytes ->
+                    doc.readBytes(appCtx).let { bytes ->
                         bookFile.writeBytes(bytes)
                     }
                 }
diff --git a/app/src/main/java/io/legado/app/model/localBook/TextFile.kt b/app/src/main/java/io/legado/app/model/localBook/TextFile.kt
index f00556ca9..23062ba2e 100644
--- a/app/src/main/java/io/legado/app/model/localBook/TextFile.kt
+++ b/app/src/main/java/io/legado/app/model/localBook/TextFile.kt
@@ -267,7 +267,7 @@ class TextFile {
                 val bookFile = LocalBook.cacheFolder.getFile(book.originName)
                 if (!bookFile.exists()) {
                     bookFile.createNewFile()
-                    DocumentUtils.readBytes(appCtx, uri)?.let {
+                    DocumentUtils.readBytes(appCtx, uri).let {
                         bookFile.writeBytes(it)
                     }
                 }
diff --git a/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt b/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
index f0a52176c..e21157ade 100644
--- a/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt
@@ -278,11 +278,9 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
                             if (file.isFile) {
                                 when {
                                     //正文模板
-                                    file.name.equals(
-                                        "chapter.html",
-                                        true
-                                    ) || file.name.equals("chapter.xhtml", true) -> {
-                                        contentModel = file.readText(context) ?: ""
+                                    file.name.equals("chapter.html", true)
+                                            || file.name.equals("chapter.xhtml", true) -> {
+                                        contentModel = file.readText(context)
                                     }
                                     //封面等其他模板
                                     true == file.name?.endsWith("html", true) -> {
@@ -296,7 +294,7 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
                                                 book.getDisplayIntro(),
                                                 book.kind,
                                                 book.wordCount,
-                                                file.readText(context) ?: "",
+                                                file.readText(context),
                                                 "${folder.name}/${file.name}"
                                             )
                                         )
diff --git a/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt b/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt
index 6ff08a850..3bee08141 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt
@@ -223,7 +223,7 @@ class BgTextConfigDialog : BaseDialogFragment(R.layout.dialog_read_bg_text) {
             if (fontPath.isNotEmpty()) {
                 val fontName = FileUtils.getName(fontPath)
                 val fontBytes = fontPath.parseToUri().readBytes(requireContext())
-                fontBytes?.let {
+                fontBytes.let {
                     val fontExportFile = FileUtils.createFileIfNotExist(configDir, fontName)
                     fontExportFile.writeBytes(it)
                     exportFiles.add(fontExportFile)
@@ -309,7 +309,7 @@ class BgTextConfigDialog : BaseDialogFragment(R.layout.dialog_read_bg_text) {
     private fun importConfig(uri: Uri) {
         execute {
             @Suppress("BlockingMethodInNonBlockingContext")
-            importConfig(uri.readBytes(requireContext())!!)
+            importConfig(uri.readBytes(requireContext()))
         }.onError {
             Timber.e(it)
             longToast("导入失败:${it.localizedMessage}")