diff --git a/src/gui_parts.py b/src/gui_parts.py
index 8e14fdd..f172630 100644
--- a/src/gui_parts.py
+++ b/src/gui_parts.py
@@ -124,6 +124,8 @@ def __init__(self, master, default=""):
             validate="key",
             validatecommand=(self.register(self._validate), "%P"),
         )
+        if default == "":
+            default = "untitled"
         self.calc_case_entry.insert(tk.END, default)
         self.calc_case_entry.pack(side=tk.LEFT, padx=(0, 5))
 
@@ -359,6 +361,7 @@ def set_state(self, state):
     def set_trace(self, func):
         self.var.trace("w", func)
 
+
 class ToolTip:
     def __init__(self, widget, text):
         self.widget = widget