diff --git a/arkindex_worker/worker/base.py b/arkindex_worker/worker/base.py
index d638df80e9e4bfa79541092fec7adf6b37ed45fb..1be5df4f422b63e49f83ad06a40a06eb0a81e99e 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 = []
@@ -257,15 +264,15 @@ class BaseWorker:
 
         # Load model version configuration when available
         model_version = worker_run.get("model_version")
-        if model_version and model_version.get("configuration"):
+        if model_version:
             logger.info("Loaded model version configuration from WorkerRun")
-            self.model_configuration.update(model_version.get("configuration"))
+            self.model_configuration.update(model_version["configuration"])
 
             # Set model_version ID as worker attribute
-            self.model_version_id = model_version.get("id")
+            self.model_version_id = model_version["id"]
 
             # Set model details as worker attribute
-            self.model_details = model_version.get("model")
+            self.model_details = model_version["model"]
 
         # Retrieve initial configuration from API
         self.config = worker_version["configuration"].get("configuration", {})
diff --git a/tests/test_elements_worker/test_worker.py b/tests/test_elements_worker/test_worker.py
index f84ef2475b214cad30de9fae1f367cb1816b5264..30f81a493f25e876683e678d9763971c7f1ae5cd 100644
--- a/tests/test_elements_worker/test_worker.py
+++ b/tests/test_elements_worker/test_worker.py
@@ -467,6 +467,10 @@ def test_worker_config_multiple_source(
             "id": "12341234-1234-1234-1234-123412341234",
             "name": "Model version 1337",
             "configuration": model_config,
+            "model": {
+                "id": "hahahaha-haha-haha-haha-hahahahahaha",
+                "name": "My model",
+            },
         },
         "process": {
             "name": None,