diff --git a/v1_5_0_C/index.html b/v1_5_0_C/index.html
index 9436084..f5014ed 100644
--- a/v1_5_0_C/index.html
+++ b/v1_5_0_C/index.html
@@ -223,7 +223,7 @@
                     let data = {
                         "key": this.key,
                         "code": this.code,
-                        "code_unique_str": localStorage.getItem('unique_str')
+                        "code_unique_str": sessionStorage.getItem('unique_str')
                     }
                     req.axiosPost('/key/login', data).then(res => {
                         setTimeout(() => {