diff --git a/qt/aqt/clayout.py b/qt/aqt/clayout.py
index 590330ec7..377fa2f47 100644
--- a/qt/aqt/clayout.py
+++ b/qt/aqt/clayout.py
@@ -700,8 +700,8 @@ class CardLayout(QDialog):
         f.afmt.setText(t.get("bafmt", ""))
         if t.get("bfont"):
             f.overrideFont.setChecked(True)
-        f.font.setCurrentFont(QFont(t.get("bfont", "Arial")))
-        f.fontSize.setValue(t.get("bsize", 12))
+        f.font.setCurrentFont(QFont(t.get("bfont") or "Arial"))
+        f.fontSize.setValue(t.get("bsize") or 12)
         qconnect(f.buttonBox.accepted, lambda: self.onBrowserDisplayOk(f))
         d.exec_()