diff --git a/internal/data/mixrepoimpl/cmb.go b/internal/data/mixrepoimpl/cmb.go
index ff1d0f4..fb57e48 100644
--- a/internal/data/mixrepoimpl/cmb.go
+++ b/internal/data/mixrepoimpl/cmb.go
@@ -119,6 +119,10 @@ func (s *CmbMixRepoImpl) GetRequest(_ context.Context, reqBo *bo.CmbRequestBo) (
 
 func (s *CmbMixRepoImpl) GetMockRequest(_ context.Context, bizContent string) (*v1.CmbRequest, error) {
 
+	if len(s.bc.Cmb.CmbSm2Pik) == 0 {
+		return nil, errors.New("mock cmb sm2 pik is empty")
+	}
+
 	encryptBody, err := cmb.Encrypt(s.bc.Cmb.Sm2Puk, bizContent)
 	if err != nil {
 		return nil, err