diff --git a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
index 146cb90d7..6b000211a 100644
--- a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
+++ b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeRule.kt
@@ -170,8 +170,8 @@ class AnalyzeRule(var book: BaseBook? = null) {
      * 获取文本
      */
     @Throws(Exception::class)
-    fun getString(ruleStr: String, isUrl: Boolean = false): String? {
-        if (TextUtils.isEmpty(ruleStr)) return null
+    fun getString(ruleStr: String?, isUrl: Boolean = false): String {
+        if (TextUtils.isEmpty(ruleStr)) return ""
         val ruleList = splitSourceRule(ruleStr)
         return getString(ruleList, isUrl)
     }
diff --git a/app/src/main/java/io/legado/app/model/webbook/BookContent.kt b/app/src/main/java/io/legado/app/model/webbook/BookContent.kt
index 9db46adb1..6e05d8e5d 100644
--- a/app/src/main/java/io/legado/app/model/webbook/BookContent.kt
+++ b/app/src/main/java/io/legado/app/model/webbook/BookContent.kt
@@ -132,7 +132,7 @@ object BookContent {
             }
             SourceDebug.printLog(bookSource.bookSourceUrl, "└" + nextUrlList.joinToString("，"), printLog)
         }
-        val content = analyzeRule.getString(contentRule.content ?: "")?.htmlFormat() ?: ""
+        val content = analyzeRule.getString(contentRule.content).htmlFormat()
         return ContentData(content, nextUrlList)
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/model/webbook/BookInfo.kt b/app/src/main/java/io/legado/app/model/webbook/BookInfo.kt
index 0e9933ae5..ff556130f 100644
--- a/app/src/main/java/io/legado/app/model/webbook/BookInfo.kt
+++ b/app/src/main/java/io/legado/app/model/webbook/BookInfo.kt
@@ -31,43 +31,43 @@ object BookInfo {
             }
         }
         SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取书名")
-        analyzeRule.getString(infoRule.name ?: "")?.let {
+        analyzeRule.getString(infoRule.name).let {
             if (it.isNotEmpty()) book.name = it
         }
         SourceDebug.printLog(bookSource.bookSourceUrl, "└${book.name}")
         SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取作者")
-        analyzeRule.getString(infoRule.author ?: "")?.let {
+        analyzeRule.getString(infoRule.author).let {
             if (it.isNotEmpty()) book.author = it
         }
         SourceDebug.printLog(bookSource.bookSourceUrl, "└${book.author}")
         SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取分类")
-        analyzeRule.getString(infoRule.kind ?: "")?.let {
+        analyzeRule.getString(infoRule.kind).let {
             if (it.isNotEmpty()) book.kind = it
         }
         SourceDebug.printLog(bookSource.bookSourceUrl, "└${book.kind}")
         SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取字数")
-        analyzeRule.getString(infoRule.wordCount ?: "")?.let {
+        analyzeRule.getString(infoRule.wordCount).let {
             if (it.isNotEmpty()) book.wordCount = it
         }
         SourceDebug.printLog(bookSource.bookSourceUrl, "└${book.wordCount}")
         SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取最新章节")
-        analyzeRule.getString(infoRule.lastChapter ?: "")?.let {
+        analyzeRule.getString(infoRule.lastChapter).let {
             if (it.isNotEmpty()) book.latestChapterTitle = it
         }
         SourceDebug.printLog(bookSource.bookSourceUrl, "└${book.latestChapterTitle}")
         SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取简介")
-        analyzeRule.getString(infoRule.intro ?: "")?.let {
+        analyzeRule.getString(infoRule.intro).let {
             if (it.isNotEmpty()) book.intro = it.htmlFormat()
         }
         SourceDebug.printLog(bookSource.bookSourceUrl, "└${book.intro}", isHtml = true)
         
         SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取封面链接")
-        analyzeRule.getString(infoRule.coverUrl ?: "")?.let {
+        analyzeRule.getString(infoRule.coverUrl).let {
             if (it.isNotEmpty()) book.coverUrl = NetworkUtils.getAbsoluteURL(baseUrl, it)
         }
         SourceDebug.printLog(bookSource.bookSourceUrl, "└${book.coverUrl}")
         SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取目录链接")
-        book.tocUrl = analyzeRule.getString(infoRule.tocUrl ?: "", true) ?: baseUrl
+        book.tocUrl = analyzeRule.getString(infoRule.tocUrl, true) ?: baseUrl
         if (book.tocUrl.isEmpty()) book.tocUrl = baseUrl
         if (book.tocUrl == baseUrl) {
             book.tocHtml = body
diff --git a/app/src/main/java/io/legado/app/model/webbook/BookList.kt b/app/src/main/java/io/legado/app/model/webbook/BookList.kt
index 85e0b9bda..85f6d5424 100644
--- a/app/src/main/java/io/legado/app/model/webbook/BookList.kt
+++ b/app/src/main/java/io/legado/app/model/webbook/BookList.kt
@@ -46,7 +46,7 @@ object BookList {
             bookSource.getExploreRule().bookList.isNullOrBlank() -> bookSource.getSearchRule()
             else -> bookSource.getExploreRule()
         }
-        var ruleList = bookListRule.bookList ?: ""
+        var ruleList: String = bookListRule.bookList ?: ""
         if (ruleList.startsWith("-")) {
             reverse = true
             ruleList = ruleList.substring(1)
@@ -63,14 +63,14 @@ object BookList {
                 bookList.add(searchBook)
             }
         } else {
-            val ruleName = analyzeRule.splitSourceRule(bookListRule.name ?: "")
-            val ruleBookUrl = analyzeRule.splitSourceRule(bookListRule.bookUrl ?: "")
-            val ruleAuthor = analyzeRule.splitSourceRule(bookListRule.author ?: "")
-            val ruleCoverUrl = analyzeRule.splitSourceRule(bookListRule.coverUrl ?: "")
-            val ruleIntro = analyzeRule.splitSourceRule(bookListRule.intro ?: "")
-            val ruleKind = analyzeRule.splitSourceRule(bookListRule.kind ?: "")
-            val ruleLastChapter = analyzeRule.splitSourceRule(bookListRule.lastChapter ?: "")
-            val ruleWordCount = analyzeRule.splitSourceRule(bookListRule.wordCount ?: "")
+            val ruleName = analyzeRule.splitSourceRule(bookListRule.name)
+            val ruleBookUrl = analyzeRule.splitSourceRule(bookListRule.bookUrl)
+            val ruleAuthor = analyzeRule.splitSourceRule(bookListRule.author)
+            val ruleCoverUrl = analyzeRule.splitSourceRule(bookListRule.coverUrl)
+            val ruleIntro = analyzeRule.splitSourceRule(bookListRule.intro)
+            val ruleKind = analyzeRule.splitSourceRule(bookListRule.kind)
+            val ruleLastChapter = analyzeRule.splitSourceRule(bookListRule.lastChapter)
+            val ruleWordCount = analyzeRule.splitSourceRule(bookListRule.wordCount)
             SourceDebug.printLog(bookSource.bookSourceUrl, "└列表大小:${collections.size}")
             for ((index, item) in collections.withIndex()) {
                 getSearchItem(
@@ -121,26 +121,26 @@ object BookList {
                 }
             }
             SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取书名")
-            searchBook.name = analyzeRule.getString(name ?: "") ?: ""
+            searchBook.name = analyzeRule.getString(name)
             SourceDebug.printLog(bookSource.bookSourceUrl, "└${searchBook.name}")
             if (searchBook.name.isNotEmpty()) {
                 SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取作者")
-                searchBook.author = BookHelp.formatAuthor(analyzeRule.getString(author ?: ""))
+                searchBook.author = BookHelp.formatAuthor(analyzeRule.getString(author))
                 SourceDebug.printLog(bookSource.bookSourceUrl, "└${searchBook.author}")
                 SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取分类")
-                searchBook.kind = analyzeRule.getString(kind ?: "")
+                searchBook.kind = analyzeRule.getString(kind)
                 SourceDebug.printLog(bookSource.bookSourceUrl, "└${searchBook.kind}")
                 SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取字数")
-                searchBook.wordCount = analyzeRule.getString(wordCount ?: "")
+                searchBook.wordCount = analyzeRule.getString(wordCount)
                 SourceDebug.printLog(bookSource.bookSourceUrl, "└${searchBook.wordCount}")
                 SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取最新章节")
-                searchBook.latestChapterTitle = analyzeRule.getString(lastChapter ?: "")
+                searchBook.latestChapterTitle = analyzeRule.getString(lastChapter)
                 SourceDebug.printLog(bookSource.bookSourceUrl, "└${searchBook.latestChapterTitle}")
                 SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取简介")
-                searchBook.intro = analyzeRule.getString(intro ?: "")
+                searchBook.intro = analyzeRule.getString(intro)
                 SourceDebug.printLog(bookSource.bookSourceUrl, "└${searchBook.intro}", true)
                 SourceDebug.printLog(bookSource.bookSourceUrl, "┌获取封面链接")
-                searchBook.coverUrl = analyzeRule.getString(coverUrl ?: "", true)
+                searchBook.coverUrl = analyzeRule.getString(coverUrl, true)
                 SourceDebug.printLog(bookSource.bookSourceUrl, "└${searchBook.coverUrl}")
                 return searchBook
             }