diff --git a/feature_capabilities/src/main/ets/providers/AudioProvider.ets b/feature_capabilities/src/main/ets/providers/AudioProvider.ets
index 2d3b2a8..c0a6186 100644
--- a/feature_capabilities/src/main/ets/providers/AudioProvider.ets
+++ b/feature_capabilities/src/main/ets/providers/AudioProvider.ets
@@ -133,7 +133,9 @@ export class AudioProvider implements CapabilityProvider {
     if (req.audiourl === '') {
       return;
     }
-    const user: string = req.user;
+    // user 可能被 H5 以数字(座位号)下发；须强转字符串再用于回投——对齐 Android json.getString("user")+""+uservoice。
+    // 否则 number 的 .length 为 undefined，桥 doSend 判空丢弃 data → H5 gameui_play_voice 收到 undefined 报错(reading '0')、座位动画不播。
+    const user: string = (req.user === undefined || req.user === null) ? '' : String(req.user);
     // 打断正在播的旧语音：先通知 H5 停旧座位动画，再释放（对齐"同一时刻只播一条"）。
     if (this.voicePlayer !== undefined && this.currentVoiceUser !== '') {
       this.bridge?.callHandler(OutboundHandlers.GameUiStopVoice, this.currentVoiceUser);