综合 - 修复运行崩溃

PDF Office/PDF Master/Class/PDFWindowController/ViewController/KMMainViewController+UI.swift

@@ -65,7 +65,9 @@ extension KMMainViewController {
         if self.isReadMode {
             self.pageNumberDisplayView.dismiss()
         } else {
-            self.pageNumberDisplayView.totalPagesCount = Int(self.listView.document.pageCount)
+            if self.listView.document != nil {
+                self.pageNumberDisplayView.totalPagesCount = Int(self.listView.document.pageCount)
+            }
             self.pageNumberDisplayView.currentPageIndex = self.listView.currentPageIndex
             self.pageNumberDisplayView.displayType = KMPreferenceManager.shared.pageIndicatorType