diff --git a/pages/login/login.vue b/pages/login/login.vue
index c2fffce..a2bff61 100644
--- a/pages/login/login.vue
+++ b/pages/login/login.vue
@@ -195,7 +195,8 @@
 
 		if (scanValue.includes('?')) {
 			const params = new URLSearchParams(scanValue.split('?')[1]);
-			return params.get('cardNum') || params.get('identifier') || '';
+			const queryValue = params.get('cardNum') || params.get('identifier');
+			if (queryValue) return queryValue;
 		}
 
 		const match = scanValue.match(/=([^=]+)$/);