diff --git a/backend/templates_cert/setup-cert.sh.j2 b/backend/templates_cert/setup-cert.sh.j2
index ba241a3..ff784a9 100644
--- a/backend/templates_cert/setup-cert.sh.j2
+++ b/backend/templates_cert/setup-cert.sh.j2
@@ -33,7 +33,10 @@ fi
 # 3. 写入定时任务
 echo "[3/4] 配置定时任务（每小时执行一次）..."
 CRON_LINE="0 * * * * ${DEPLOY_SCRIPT} >> ${LOG_FILE} 2>&1"
-(crontab -l 2>/dev/null | grep -v "${DEPLOY_SCRIPT}"; echo "${CRON_LINE}") | crontab -
+EXISTING=$(crontab -l 2>/dev/null || true)
+FILTERED=$(echo "${EXISTING}" | grep -v "${DEPLOY_SCRIPT}" || true)
+echo "${FILTERED}
+${CRON_LINE}" | crontab -
 echo "      已添加: ${CRON_LINE}"
 
 # 4. 验证