diff --git a/router.py b/router.py
index 995eb78..54edbf3 100644
--- a/router.py
+++ b/router.py
@@ -1078,6 +1078,9 @@ class fetch:
             # If anything goes wrong we cannot reply details
             message = _format_connection_issue(request_url, e)
             print(f"[fetch.endpoint_details] {message}")
+            if not skip_error_cache:
+                async with _available_error_cache_lock:
+                    _available_error_cache[endpoint] = time.time()
             return []
 
 def ep2base(ep):