diff --git a/buypeeb.py b/buypeeb.py
index 5025ada..4939cf6 100755
--- a/buypeeb.py
+++ b/buypeeb.py
@@ -144,7 +144,7 @@ class BuypeebApp:
 
 		entrybox.set_markup(text)
 		entry = Gtk.Entry()
-		entry.set_text(prefilled)
+		entry.set_text(prefilled if prefilled is not None else "")
 		entry.connect("activate", self.entryBoxResponse, entrybox, Gtk.ResponseType.OK) # allow for pressing enter instead of clicking OK
 
 		entrybox.vbox.pack_end(entry, True, True, 0)