diff --git a/arkindex_worker/worker/__init__.py b/arkindex_worker/worker/__init__.py
index af509a2bf62ca724567d65d2ee318ada2a98e425..5e888a00ef00d300ae94f67b1ae3ac0e64a2f020 100644
--- a/arkindex_worker/worker/__init__.py
+++ b/arkindex_worker/worker/__init__.py
@@ -212,7 +212,10 @@ class ElementsWorker(
                 element_id = element.id if element else item
 
                 if isinstance(e, ErrorResponse):
-                    message = f"An API error occurred while processing element {element_id}: {e.title} - {e.content}"
+                    if e.title == "404 Not Found":
+                        message = f"An API error occurred while processing element {element_id}: ARKINDEX_CORPUS_ID was not set in the environment"
+                    else:
+                        message = f"An API error occurred while processing element {element_id}: {e.title} - {e.content}"
                 else:
                     message = (
                         f"Failed running worker on element {element_id}: {repr(e)}"