diff --git a/src/caosdb/unary_rpc_handler.cpp b/src/caosdb/unary_rpc_handler.cpp
index f2307549f575f3311a5c096007a1c98b12db1722..14b2971d8b0e693d68f2e9cf35874ba4fd229e86 100644
--- a/src/caosdb/unary_rpc_handler.cpp
+++ b/src/caosdb/unary_rpc_handler.cpp
@@ -83,6 +83,7 @@ bool UnaryRpcHandler::OnNext(bool ok) {
       // with the fail-fast option. (Note that async unary RPCs don't post a CQ
       // tag at this point, nor do client-streaming or bidi-streaming RPCs that
       // have the initial metadata corked option set.)"
+      return false;
     }
 
     return true;