diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7954f1d..d452ff3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 - 💄📯 — Improve notifications and result(s) pages
 - 🔊 — Add level of log before the log message
+— 🔊 — Add a warning messages in the logs if there is no tasks in database. (fix #41)
 
 ## 0.1.1
 
diff --git a/argos/server/main.py b/argos/server/main.py
index 856a116..f3d5d14 100644
--- a/argos/server/main.py
+++ b/argos/server/main.py
@@ -8,7 +8,7 @@ from sqlalchemy import create_engine, event
 from sqlalchemy.orm import sessionmaker
 
 from argos.logging import logger
-from argos.server import models, routes
+from argos.server import models, routes, queries
 from argos.server.settings import get_app_settings, read_yaml_config
 
 
@@ -49,7 +49,16 @@ def create_start_app_handler(appli):
     async def _get_db():
         setup_database(appli)
 
-        return await connect_to_db(appli)
+        db = await connect_to_db(appli)
+
+        tasks_count = await queries.count_tasks(db)
+        if tasks_count == 0:
+            logger.warning(
+                "There is no tasks in the database. "
+                'Please launch the command "argos server reload-config"'
+            )
+
+        return db
 
     return _get_db
 
diff --git a/argos/server/queries.py b/argos/server/queries.py
index cfb3f68..f9c07f5 100644
--- a/argos/server/queries.py
+++ b/argos/server/queries.py
@@ -1,7 +1,7 @@
 """Functions to ease SQL queries management"""
 from datetime import datetime, timedelta
 from hashlib import sha256
-from typing import List
+from typing import List, Union
 from urllib.parse import urljoin
 
 from sqlalchemy import desc, func
@@ -48,12 +48,13 @@ async def create_result(db: Session, agent_result: schemas.AgentResult, agent_id
     return result
 
 
-async def count_tasks(db: Session, selected=False):
+async def count_tasks(db: Session, selected: Union[None, bool] = None):
     query = db.query(Task)
-    if selected:
-        query = query.filter(Task.selected_by is not None)
-    else:
-        query = query.filter(Task.selected_by is None)
+    if selected is not None:
+        if selected:
+            query = query.filter(Task.selected_by is not None)
+        else:
+            query = query.filter(Task.selected_by is None)
 
     return query.count()