fix

pages/echa.py

@@ -19,6 +19,10 @@ else:
     
 DATA = echa_request(cas_number)
 
+if 'substance' not in DATA:
+    st.error(DATA)
+    st.stop()
+
 def extract_tox_info_values(data):
     """Extract DNEL values from toxicological information."""
     rows = []
@@ -87,6 +91,7 @@ def extract_repeated_values(data):
 # App
 st.title("Toxicological Data Viewer")
 
+
 # Substance info
 substance = DATA["substance"]
 dossier = DATA["dossier_info"]

pyproject.toml

@@ -5,6 +5,7 @@ description = "Add your description here"
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
+    "duckdb>=1.4.3",
     "marimo>=0.18.0",
     "streamlit>=1.51.0",
 ]