Update app.py

app.py

@@ -203,16 +203,34 @@ def generate_storyboard_with_llm(user_prompt: str, n_shots: int, default_fps: in
             raise ValueError(f"LLM did not return parseable JSON.\nPreview:\n{preview}")
 
     # Parse & normalize
+    if not json_text.strip():
+        # Fallback: model returned nothing. Return a single stub shot.
+        print("⚠️ LLM returned empty output. Using fallback storyboard.")
+        fallback = [{
+            "id": 1,
+            "title": "Shot 1",
+            "description": f"Fallback shot for: {user_prompt[:50]}",
+            "duration": default_len,
+            "fps": default_fps,
+            "video_length": default_len,
+            "steps": 30,
+            "seed": None,
+            "negative": "",
+            "keyframe_path": None
+        }]
+        return fallback
+
     try:
         shots_raw = json.loads(json_text)
-    except Exception as e:
-        # Attempt a tiny cleanup: remove trailing commas
+    except Exception:
+        # Attempt a tiny cleanup: remove trailing commas and try again
         json_text_clean = re.sub(r",\s*([\]\}])", r"\1", json_text)
         shots_raw = json.loads(json_text_clean)
 
     return _normalize_shots(shots_raw, default_fps, default_len)
 
 
+
 # =========================
 # Gradio UI
 # =========================