diff --git a/modules/reference/pages/return-codes.adoc b/modules/reference/pages/return-codes.adoc
index afe0f64b..79880d1d 100644
--- a/modules/reference/pages/return-codes.adoc
+++ b/modules/reference/pages/return-codes.adoc
@@ -138,6 +138,9 @@ Other RESTPP errors.
 | `REST-12003`
 | The query failed due to insufficient disk space.
 
+| `REST-12004`
+| The query failed because the engine encountered an invalid vertex ID. This usually occurs when the query references a vertex ID that does not exist. In rare cases, it may indicate an internal error. Check the RESTPP and GPE log files on the TigerGraph server using the request ID for more details.
+
 | `REST-30000`
 | The payload is invalid (general error).