diff --git a/drb-c2-core/app/routers/admin.py b/drb-c2-core/app/routers/admin.py
index 21df096..2291044 100644
--- a/drb-c2-core/app/routers/admin.py
+++ b/drb-c2-core/app/routers/admin.py
@@ -129,7 +129,14 @@ async def debug_correlation(
     unique_call_ids = list(dict.fromkeys(all_call_ids))  # dedupe, preserve order
 
     call_docs = await asyncio.gather(*(fstore.doc_get("calls", cid) for cid in unique_call_ids))
-    call_map: dict[str, dict] = {doc["call_id"]: doc for doc in call_docs if doc}
+    # Key off the id we asked for, not doc["call_id"]. At least one stored call
+    # has no call_id field -- the document id is authoritative and always
+    # present, while the field is written by the upload path and evidently was
+    # not always there. Indexing the field raised KeyError and took the whole
+    # debug view down with a 500 over a single malformed document.
+    call_map: dict[str, dict] = {
+        cid: doc for cid, doc in zip(unique_call_ids, call_docs) if doc
+    }
 
     # ── Build incident debug records ──────────────────────────────────────────
     incident_records = []