diff --git a/concept-maker_gui.py b/concept-maker_gui.py
index 83ba16f..ea85cca 100644
--- a/concept-maker_gui.py
+++ b/concept-maker_gui.py
@@ -694,6 +694,7 @@ class App(TkinterDnD.Tk):  # type: ignore
         self.rephrase_selected_key: Optional[str] = None
         self._suppress_rephrase_select: bool = False
         self._rephrase_visible: bool = False
+        self._image_prompt_value: str = IMAGE_PROMPT_PLACEHOLDER
 
         # Defaults
         self.ollama_host = tk.StringVar(value=os.environ.get("OLLAMA_HOST", "http://localhost:11434"))