diff --git a/src/views/system/deviceManage/editConfig.vue b/src/views/system/deviceManage/editConfig.vue
index bd2909cc2..f3c7eced5 100644
--- a/src/views/system/deviceManage/editConfig.vue
+++ b/src/views/system/deviceManage/editConfig.vue
@@ -127,10 +127,12 @@ export default {
                     }
                 });
                 let flag = false;
-                for (var i = 0; i < value.length; i++) {
-                    const ascallCode = value.charCodeAt(i);
-                    if (ascallCode > 70 || ascallCode < 48 || (ascallCode > 57 && ascallCode < 65)) {
-                        flag = true;
+                if (value && value.length) {
+                    for (var i = 0; i < value.length; i++) {
+                        const ascallCode = value.charCodeAt(i);
+                        if (ascallCode > 70 || ascallCode < 48 || (ascallCode > 57 && ascallCode < 65)) {
+                            flag = true;
+                        }
                     }
                 }
                 if (!value) {