diff --git a/bblfsh/launcher.py b/bblfsh/launcher.py
index <HASH>..<HASH> 100644
--- a/bblfsh/launcher.py
+++ b/bblfsh/launcher.py
@@ -10,7 +10,7 @@ def ensure_bblfsh_is_running():
     try:
         container = client.containers.get("bblfsh")
         if container.status != "running":
-            raise docker.errors.NotFound()
+            raise docker.errors.NotFound(message="not running")
         return True
     except docker.errors.NotFound:
         container = client.containers.run(
Fix raising the exception while raising the exception