Merge pull request #720 from houqp/new_ui_fix

fix: check number of pages before calling hintPage

frontend/ui/reader/readerview.lua

@@ -164,7 +164,13 @@ function ReaderView:onRotationUpdate(rotation)
 end
 
 function ReaderView:onHintPage()
-	self.ui.document:hintPage(self.state.page+1, self.state.zoom, self.state.rotation, self.render_mode)
+	if self.state.page < self.ui.document.info.number_of_pages then
+		self.ui.document:hintPage(
+			self.state.page+1, 
+			self.state.zoom, 
+			self.state.rotation, 
+			self.render_mode)
+	end
 	return true
 end