diff --git a/test/mpi_enc_test.c b/test/mpi_enc_test.c
index 368f2cee..2492b656 100644
--- a/test/mpi_enc_test.c
+++ b/test/mpi_enc_test.c
@@ -197,9 +197,11 @@ MPP_RET test_ctx_init(MpiEncMultiCtxInfo *info)
         }
     }
 
-    p->fp_verify = fopen(cmd->file_slt, "wt");
-    if (!p->fp_verify)
-        mpp_err("failed to open verify file %s\n", cmd->file_slt);
+    if (cmd->file_slt) {
+        p->fp_verify = fopen(cmd->file_slt, "wt");
+        if (!p->fp_verify)
+            mpp_err("failed to open verify file %s\n", cmd->file_slt);
+    }
 
     // update resource parameter
     switch (p->fmt & MPP_FRAME_FMT_MASK) {
diff --git a/utils/mpi_dec_utils.c b/utils/mpi_dec_utils.c
index a8086f6f..693f1eb4 100644
--- a/utils/mpi_dec_utils.c
+++ b/utils/mpi_dec_utils.c
@@ -737,5 +737,6 @@ void mpi_dec_test_cmd_options(MpiDecTestCmd* cmd)
     mpp_log("height     : %4d\n", cmd->height);
     mpp_log("type       : %4d\n", cmd->type);
     mpp_log("max frames : %4d\n", cmd->frame_num);
-    mpp_log("verify     : %s\n", cmd->file_slt);
+    if (cmd->file_slt)
+        mpp_log("verify     : %s\n", cmd->file_slt);
 }
diff --git a/utils/mpi_enc_utils.c b/utils/mpi_enc_utils.c
index 2ab7c324..e1d2b4dd 100644
--- a/utils/mpi_enc_utils.c
+++ b/utils/mpi_enc_utils.c
@@ -952,7 +952,8 @@ MPP_RET mpi_enc_test_cmd_show_opt(MpiEncTestArgs* cmd)
     mpp_log("height     : %d\n", cmd->height);
     mpp_log("format     : %d\n", cmd->format);
     mpp_log("type       : %d\n", cmd->type);
-    mpp_log("verify     : %s\n", cmd->file_slt);
+    if (cmd->file_slt)
+        mpp_log("verify     : %s\n", cmd->file_slt);
 
     return MPP_OK;
 }