diff --git a/src/app.py b/src/app.py
index 6585e0a..9e150a9 100644
--- a/src/app.py
+++ b/src/app.py
@@ -177,7 +177,9 @@ navbar = dbc.Navbar(
                         dbc.NavItem(
                             dbc.NavLink(
                                 page["name"].replace(" ", " "),
-                                href=page["relative_path"],
+                                href=page["relative_path"] + "/presentation"
+                                if page["name"] == "À propos"
+                                else page["relative_path"],
                                 active="exact",
                             )
                         )
diff --git a/src/pages/_apropos_shell.py b/src/pages/_apropos_shell.py
index 6db5635..b2fa6d0 100644
--- a/src/pages/_apropos_shell.py
+++ b/src/pages/_apropos_shell.py
@@ -3,16 +3,16 @@ from dash import Input, Output, State, callback, html
 
 SECTIONS = [
     {"key": "presentation", "label": "Présentation", "href": "/a-propos/presentation"},
+    {"key": "explorer", "label": "Explorer le projet", "href": "/a-propos/explorer"},
+    {"key": "sources", "label": "Sources de données", "href": "/a-propos/sources"},
+    {"key": "qualite", "label": "Qualité des données", "href": "/a-propos/qualite"},
     {
         "key": "donnees-brutes",
         "label": "Données brutes",
         "href": "/a-propos/donnees-brutes",
     },
-    {"key": "contact", "label": "Contact", "href": "/a-propos/contact"},
     {"key": "contribuer", "label": "Contribuer", "href": "/a-propos/contribuer"},
-    {"key": "explorer", "label": "Explorer le projet", "href": "/a-propos/explorer"},
-    {"key": "qualite", "label": "Qualité des données", "href": "/a-propos/qualite"},
-    {"key": "sources", "label": "Sources de données", "href": "/a-propos/sources"},
+    {"key": "contact", "label": "Contact", "href": "/a-propos/contact"},
     {
         "key": "mentions-legales",
         "label": "Mentions légales",
diff --git a/src/pages/marche.py b/src/pages/marche.py
index 49b42be..928e3db 100644
--- a/src/pages/marche.py
+++ b/src/pages/marche.py
@@ -135,6 +135,7 @@ def update_marche_info(marche, titulaires):
                     "considerationsEnvironnementales",
                 ]
                 and col in marche
+                and marche[col]
                 and "," in marche[col]
             ):
                 col_values = marche[col].split(", ")