diff --git a/run.py b/run.py
index 632883d..0f7c1a3 100644
--- a/run.py
+++ b/run.py
@@ -41,7 +41,10 @@ def stacosys_server(config_pathname):
 
     # load config
     conf = Config.load(config_pathname)
-    conf.check()
+    is_config_ok, erreur_config = conf.check()
+    if not is_config_ok:
+        logger.error(f"Configuration incorrecte '{erreur_config}'")
+        sys.exit(1)
     logger.info(conf)
 
     # check database file exists (prevents from creating a fresh db)
diff --git a/stacosys/conf/config.py b/stacosys/conf/config.py
index 8399e2e..5315036 100644
--- a/stacosys/conf/config.py
+++ b/stacosys/conf/config.py
@@ -71,12 +71,19 @@ class Config:
 
     def get_bool(self, key: ConfigParameter):
         value = self.get(key)
-        assert value in ("yes", "true", "no", "false")
+        assert value in (
+            "yes",
+            "true",
+            "no",
+            "false",
+        ), f"Parameètre booléen incorrect {key.value}"
         return value in ("yes", "true")
 
     def check(self):
         for key in ConfigParameter:
-            assert self.get(key), f"Paramètre introuvable : {key.value}"
+            if not self.get(key):
+                return (False, key.value)
+        return (True, None)
 
     def __repr__(self):
         d = dict()