diff --git a/arkindex_worker/worker/base.py b/arkindex_worker/worker/base.py
index d638df80e9e4bfa79541092fec7adf6b37ed45fb..765afd43959e330d37beb3b69ab193a7b97ea642 100644
--- a/arkindex_worker/worker/base.py
+++ b/arkindex_worker/worker/base.py
@@ -148,6 +148,13 @@ class BaseWorker:
         # there is at least one available sqlite database either given or in the parent tasks
         self.use_cache = False
 
+        # model_version_id will be updated in configure() using the worker_run's model version
+        # or in configure_for_developers() from the environment
+        self.model_version_id = None
+        # model_details will be updated in configure() using the worker_run's model version
+        # or in configure_for_developers() from the environment
+        self.model_details = {}
+
         # task_parents will be updated in configure_cache() if the cache is supported,
         # if the task ID is set and if no database is passed as argument
         self.task_parents = []