diff --git a/CHANGELOG.md b/CHANGELOG.md
index e055882a..df192048 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ CHANGELOG for FlatCAM beta
 - fixed the "headless" feature; running headless still start the GUI just it does not show it
 - when running headless the sys tray icon will always be shown so the user can close the app correctly
 - in the systray icon context menu I've added a menu entry to toggle the GUI
+- fixed a possible issue with having older versions of QSettings (leftovers from previous installations of this app)
 
 24.08.2021
 
diff --git a/FlatCAM.py b/FlatCAM.py
index 23f69d5d..fee30a4f 100644
--- a/FlatCAM.py
+++ b/FlatCAM.py
@@ -157,7 +157,11 @@ if __name__ == '__main__':
     settings = QSettings("Open Source", "FlatCAM")
     if settings.contains("style"):
         style_index = settings.value('style', type=str)
-        style = QtWidgets.QStyleFactory.keys()[int(style_index)]
+        try:
+            idx = int(style_index)
+        except Exception:
+            idx = 0
+        style = QtWidgets.QStyleFactory.keys()[idx]
         app.setStyle(style)
 
     fc = App(qapp=app)