Update app/materials_library.py

app/materials_library.py

@@ -894,7 +894,7 @@ def display_material_editor():
         col1, col2 = st.columns(2)
         
         with col1:
-            category_index = MATERIAL_CATEGORIES.index(form_state.get("category", editor_state["category", MATERIAL_CATEGORIES[0]))
+            category_index = MATERIAL_CATEGORIES.index(form_state.get("category", editor_state.get("category", MATERIAL_CATEGORIES[0])))
             category = st.selectbox(
                 "Category",
                 MATERIAL_CATEGORIES,