Update app.py

app.py

@@ -225,8 +225,8 @@ if st.session_state.get("example", True):
     data, wcs = load_file(f"{fname}.fits")
 
 if "data" not in locals():
-    data = np.ones((128,128)) * (-1)
-        
+    data, wcs = np.ones((128,128)) * (-1), None
+
 # Make six columns for buttons
 _, col1, col2, col3, col4, col5, col6, _ = st.columns([bordersize,0.5,0.5,0.5,0.5,0.5,0.5,bordersize])
 col1.subheader("Input image")