diff --git a/src/openeo_gfmap/manager/job_manager.py b/src/openeo_gfmap/manager/job_manager.py
index 05bc2c0..0f1ef63 100644
--- a/src/openeo_gfmap/manager/job_manager.py
+++ b/src/openeo_gfmap/manager/job_manager.py
@@ -129,8 +129,7 @@ def __init__(
         self._catalogue_cache = output_dir / "catalogue_cache.bin"
 
         self.stac = stac
-        if stac is not None:
-            self.lock = Lock()
+        self.lock = Lock()
         self.stac_enabled = stac_enabled
         self.collection_id = collection_id
         self.collection_description = collection_description