diff --git a/validator/client/validator.go b/validator/client/validator.go
index 66c01c238..f08d257a9 100644
--- a/validator/client/validator.go
+++ b/validator/client/validator.go
@@ -261,7 +261,8 @@ func (v *validator) UpdateAssignments(ctx context.Context, slot uint64) error {
 				// TODO(4379): Make validator index part of the assignment respond.
 				res, err := v.validatorClient.ValidatorIndex(ctx, &pb.ValidatorIndexRequest{PublicKey: assignment.PublicKey})
 				if err != nil {
-					return err
+					log.Warnf("Validator pub key %#x does not exist in beacon node", bytesutil.Trunc(assignment.PublicKey))
+					continue
 				}
 				v.pubKeyToID[bytesutil.ToBytes48(assignment.PublicKey)] = res.Index
 			}