diff --git a/lib/read.py b/lib/read.py
index 334bbe3..f702851 100644
--- a/lib/read.py
+++ b/lib/read.py
@@ -206,6 +206,8 @@ class ReadDialog(QDialog, Ui_ReadDialog):
         if msPerTick < 3:
             msPerTick = 3
         self.target = value + delta
+        if self.target > self.paraEdit.verticalScrollBar().maximum():
+            self.target = self.paraEdit.verticalScrollBar().maximum() - 1
         timer = QTimer(self)
         timer.timeout.connect(self.softTick)
         timer.start(msPerTick)
@@ -214,6 +216,7 @@ class ReadDialog(QDialog, Ui_ReadDialog):
     @pyqtSlot()
     def softTick(self) -> None:
         value = self.paraEdit.verticalScrollBar().value()
+        maxValue = self.paraEdit.verticalScrollBar().maximum()
         sender: QTimer = cast(QTimer, self.sender())
         if self.pxPerTick < 0:  # moving content up
             if value < self.target: