diff --git a/src/qhexedit.cpp b/src/qhexedit.cpp
index 9736579..78c13b9 100644
--- a/src/qhexedit.cpp
+++ b/src/qhexedit.cpp
@@ -995,11 +995,16 @@ void QHexEdit::paintEvent(QPaintEvent *event)
         if (_editAreaIsAscii)
         {
             // every 2 hex there is 1 ascii
-            int ch = (uchar)_dataShown.at(hexPos / 2);
-            if (ch < ' ' || ch > '~')
-                ch = _defaultChar;
+            int asciiPos = hexPos / 2;
+            // The cursor can go out of the currently displayed data
+            if (asciiPos < _dataShown.size())
+            {
+                int ch = (uchar)_dataShown.at(asciiPos);
+                if (ch < ' ' || ch > '~')
+                    ch = '.';
 
-            painter.drawText(_pxCursorX - pxOfsX, _pxCursorY, QChar(ch));
+                painter.drawText(_pxCursorX - pxOfsX, _pxCursorY, QChar(ch));
+            }
         }
         else
         {