diff --git a/app/decorators.py b/app/decorators.py
index 08aea4f7..d8816d61 100644
--- a/app/decorators.py
+++ b/app/decorators.py
@@ -186,7 +186,10 @@ def scodoc7func(func):
             arg_names = argspec.args
         for arg_name in arg_names:  # pour chaque arg de la fonction vue
             # peut produire une KeyError s'il manque un argument attendu:
-            v = req_args[arg_name]
+            try:
+                v = req_args[arg_name]
+            except KeyError as exc:
+                raise ScoValueError(f"argument {arg_name} manquant") from exc
             # try to convert all arguments to INTEGERS
             # necessary for db ids and boolean values
             try:
diff --git a/app/templates/sco_value_error.j2 b/app/templates/sco_value_error.j2
index 94b60310..e9dbd86f 100644
--- a/app/templates/sco_value_error.j2
+++ b/app/templates/sco_value_error.j2
@@ -15,4 +15,11 @@
     {% endif %}
 </p>
 
+<p style="margin-top: 32px;" class="help">
+Si le problème persiste, merci de contacter le support ScoDoc via
+<a class="stdlink" noreferer href="{{scu.SCO_DISCORD_ASSISTANCE|safe}}">
+{{scu.SCO_DISCORD_ASSISTANCE}}
+</a>
+</p>
+
 {% endblock %}
\ No newline at end of file