diff --git a/app/src/main/java/com/all/pdfreader/pdf/reader/room/repository/PdfRepository.kt b/app/src/main/java/com/all/pdfreader/pdf/reader/room/repository/PdfRepository.kt
index 56b5a27..a10a143 100644
--- a/app/src/main/java/com/all/pdfreader/pdf/reader/room/repository/PdfRepository.kt
+++ b/app/src/main/java/com/all/pdfreader/pdf/reader/room/repository/PdfRepository.kt
@@ -84,12 +84,16 @@ class PdfRepository private constructor(context: Context) {
     }
 
     suspend fun updateReadingProgress(filePath: String, page: Int, progress: Float) {
-        val document = pdfDao.getByPath(filePath)?.copy(
-            lastOpenedTime = System.currentTimeMillis(),
+        val old = pdfDao.getByPath(filePath) ?: return
+
+        // 修复旧数据里可能为 null 的字段
+        val safeDocument = old.copy(
+            readingProgress = progress.takeIf { !it.isNaN() } ?: 0f,
             lastReadPage = page,
-            readingProgress = progress
+            lastOpenedTime = System.currentTimeMillis()
         )
-        document?.let { pdfDao.update(it) }
+
+        pdfDao.update(safeDocument)
     }
 
     //复制更新不会更新flow
diff --git a/app/src/main/java/com/all/pdfreader/pdf/reader/ui/act/PdfViewActivity.kt b/app/src/main/java/com/all/pdfreader/pdf/reader/ui/act/PdfViewActivity.kt
index 2288075..aeb24a9 100644
--- a/app/src/main/java/com/all/pdfreader/pdf/reader/ui/act/PdfViewActivity.kt
+++ b/app/src/main/java/com/all/pdfreader/pdf/reader/ui/act/PdfViewActivity.kt
@@ -334,7 +334,8 @@ class PdfViewActivity : BaseActivity(), OnLoadCompleteListener, OnPageChangeList
     override fun onPageChanged(page: Int, pageCount: Int) {
         // 保存阅读进度到内存
         pdfDocument = pdfDocument.copy(
-            lastReadPage = page, readingProgress = (page.toFloat() / pageCount.toFloat()) * 100
+            lastReadPage = page,
+            readingProgress = calcProgress(page, pageCount)
         )
         saveReadingProgress()
 
@@ -364,6 +365,19 @@ class PdfViewActivity : BaseActivity(), OnLoadCompleteListener, OnPageChangeList
         }
     }
 
+    private fun calcProgress(page: Int, pageCount: Int): Float {
+        if (pageCount <= 0) return 0f
+
+        val raw = (page.toFloat() / pageCount.toFloat()) * 100f
+
+        return when {
+            raw.isNaN() || raw.isInfinite() -> 0f
+            raw < 0f -> 0f
+            raw > 100f -> 100f
+            else -> raw
+        }
+    }
+
     private fun showPasswordDialog(file: File) {
         val pdfPasswordProtectionDialogFragment =
             PdfPasswordProtectionDialogFragment.newInstance(file.absolutePath)