I have this helper template

{{/*
Selector labels
*/}}
{{- define "app.selectorLabels" -}}
app.kubernetes.io/name: {{ include "app.name" . }}
app.kubernetes.io/instance: {{ .Release.Name }}
{{- with .Values.app.selectorLabels }}
{{- range $key, $value := . }}
{{ $key }}: {{ $value | quote }}
{{- end }}
{{- end }}
{{- end }}

the values.yaml looks like

nameOverride: alexandria
namespace: alexandria
image:
  repository: test/alexandria
  tag: 59def22
service:
  containerPort: 9001
  port: 9001
replicas: 1
resources:
  requests:
    memory: "750Mi"
    cpu: "2000m"
  limits:
    memory: "3Gi"
    cpu: "3500m"
prometheus:
  port: 9001
job:
  enabled: false

service template looks like

{{- if and .Values.service (not .Values.rollout) }}
apiVersion: v1
kind: Service
metadata:
  name: {{ include "app.name" . }}
  namespace: {{ .Values.namespace }}
  labels:
    {{- include "app.labels" . | nindent 4 }}
spec:
  type: ClusterIP
  ports:
  - name: {{ include "app.name" .  | trunc 15 }}
    port: {{ default "80" .Values.service.port }}
    protocol: TCP
    targetPort: {{ .Values.service.containerPort }}
  selector:
    {{- include "app.selectorLabels" . | nindent 4 }}
{{- end }}

I get this error if I don’t define the app.selector in values.yaml. Can someone help please

Error: template: base-chart/templates/service.yaml:8:8: executing "base-chart/templates/service.yaml" at <include "app.labels" .>: error calling include: template: base-chart/templates/_helpers.tpl:12:3: executing "app.labels" at <include "app.selectorLabels" .>: error calling include: template: base-chart/templates/_helpers.tpl:25:14: executing "app.selectorLabels" at <.Values.app.selectorLabels>: nil pointer evaluating interface {}.selectorLabels
helm.go:84: [debug] template: base-chart/templates/service.yaml:8:8: executing "base-chart/templates/service.yaml" at <include "app.labels" .>: error calling include: template: base-chart/templates/_helpers.tpl:12:3: executing "app.labels" at <include "app.selectorLabels" .>: error calling include: template: base-chart/templates/_helpers.tpl:25:14: executing "app.selectorLabels" at <.Values.app.selectorLabels>: nil pointer evaluating interface {}.selectorLabels
If I don't define the app.selector then I get error