diff --git a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt
index a89d78ec8..d37fda70f 100644
--- a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt
+++ b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt
@@ -117,8 +117,9 @@ class AnalyzeUrl(
 
             //替换所有内嵌{{js}}
             val url = analyze.innerRule("{{", "}}") {
-                when (val jsEval = SCRIPT_ENGINE.eval(it, bindings)) {
-                    is String -> jsEval
+                val jsEval = SCRIPT_ENGINE.eval(it, bindings) ?: ""
+                when {
+                    jsEval is String -> jsEval
                     jsEval is Double && jsEval % 1.0 == 0.0 -> String.format("%.0f", jsEval)
                     else -> jsEval.toString()
                 }
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
index 354d665e9..9e4b37673 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
@@ -592,7 +592,7 @@ class ReadBookActivity : ReadBookBaseActivity(),
         resetPageOffset: Boolean,
         success: (() -> Unit)?
     ) {
-        lifecycleScope.launch {
+        runOnUI {
             autoPageProgress = 0
             binding.readView.upContent(relativePosition, resetPageOffset)
             binding.readMenu.setSeekPage(ReadBook.durPageIndex())
@@ -605,13 +605,13 @@ class ReadBookActivity : ReadBookBaseActivity(),
      * 更新视图
      */
     override fun upView() {
-        lifecycleScope.launch {
+        runOnUI {
             binding.readMenu.upBookView()
         }
     }
 
     override fun upPageAnim() {
-        lifecycleScope.launch {
+        runOnUI {
             binding.readView.upPageAnim()
         }
     }
@@ -620,11 +620,11 @@ class ReadBookActivity : ReadBookBaseActivity(),
      * 页面改变
      */
     override fun pageChanged() {
-        autoPageProgress = 0
-        lifecycleScope.launch {
+        runOnUI {
+            autoPageProgress = 0
             binding.readMenu.setSeekPage(ReadBook.durPageIndex())
+            mHandler.postDelayed(backupRunnable, 600000)
         }
-        mHandler.postDelayed(backupRunnable, 600000)
     }
 
     /**