diff --git a/scripts/gateway-watchdog.sh b/scripts/gateway-watchdog.sh
index b557240..1427d45 100755
--- a/scripts/gateway-watchdog.sh
+++ b/scripts/gateway-watchdog.sh
@@ -52,8 +52,9 @@ count_recent_429() {
         [ "$fsize" -lt 100 ] && continue
 
         # 搜索 429 错误：errorCode=1305 或 errorMessage 含 "429"
-        local found
-        found=$(grep -c '"errorCode".*"1305"\|"errorMessage".*"429"' "$jsonl" 2>/dev/null || echo 0)
+        local found=0
+        found=$(grep -c '"errorCode".*"1305"\|"errorMessage".*"429"' "$jsonl" 2>/dev/null || true)
+        [ -z "$found" ] && found=0
         # 进一步过滤：只统计时间窗口内的
         if [ "$found" -gt 0 ]; then
             local recent