[BUG] Invalid memory address on Kubernetes v1.24 about prometheus-msteams HOT 3 OPEN

customCardTempalate: |
  {{ define "teams.card" }}
  {
    "@type": "MessageCard",
    "@context": "http://schema.org/extensions",
    "themeColor": "{{- if eq .Status "resolved" -}}2DC72D
                  {{- else if eq .Status "firing" -}}
                      {{- if eq .CommonLabels.severity "critical" -}}8C1A1A
                      {{- else if eq .CommonLabels.severity "warning" -}}FFA500
                      {{- else -}}808080{{- end -}}
                  {{- else -}}808080{{- end -}}",
    "summary": "{{ .CommonAnnotations.summary }}",
    "title": "Prometheus Alert ({{ .Status }})",
    "sections": [ {{$externalUrl := .ExternalURL}}
    {{- range $index, $alert := .Alerts }}{{- if $index }},{{- end }}
      {
        "activityTitle": "[{{ $alert.Annotations.description }}]({{ $externalUrl }})", 
        "facts": [
          {{- range $key, $value := $alert.Annotations }}
          {
            "name": "{{ reReplaceAll "_" "\\\\_" $key }}",
            "value": "{{ reReplaceAll "_" "\\\\_" $value }}"
          },
          {{- end -}}
          {{$c := counter}}{{ range $key, $value := $alert.Labels }}{{if call $c}},{{ end }}
          {
            "name": "{{ reReplaceAll "_" "\\\\_" $key }}",
            "value": "{{ reReplaceAll "_" "\\\\_" $value }}"
          }
          {{- end }}
        ],
        "markdown": true
      }
      {{- end }}
    ]
  }
  {{ end }}