企业微信webhook发送成功但返回报错

[yhgroup]

\controllers\weixin.go
res, err := client.Post(WXurl, "application/json", b)
if err != nil {
logs.Error(logsign, "[weixin]", err.Error())
}
defer res.Body.Close()

错误：

PrometheusAlert:runtime error: invalid memory address or nil pointer dereference

Request Method: | POST -- | -- Request URL: | /prometheusalert?type=wx&tpl=...... RemoteAddr: | 192.168.0.192

Stack

/opt/go/src/runtime/panic.go:884
/opt/go/src/runtime/panic.go:260
/opt/go/src/runtime/signal_unix.go:841
/data/zjk/src/PrometheusAlert/controllers/weixin.go:88
/data/zjk/src/PrometheusAlert/controllers/prometheusalert.go:445
/data/zjk/src/PrometheusAlert/controllers/prometheusalert.go:195
/opt/go/src/reflect/value.go:586
/opt/go/src/reflect/value.go:370
/data/zjk/src/PrometheusAlert/vendor/github.com/astaxie/beego/router.go:897
/opt/go/src/net/http/server.go:2936
/opt/go/src/net/http/server.go:1995
/opt/go/src/runtime/asm_amd64.s:1598