diff --git a/charts/meta-monitoring/templates/validate.yaml b/charts/meta-monitoring/templates/validate.yaml
index 7b2b9a8..767d6ed 100644
--- a/charts/meta-monitoring/templates/validate.yaml
+++ b/charts/meta-monitoring/templates/validate.yaml
@@ -33,3 +33,7 @@
 {{- end -}}
 {{- end -}}
 {{- end -}}
+
+{{- if empty .Values.namespacesToMonitor -}}
+  {{- fail "No namespaces have been specified in namespacesToMonitor" -}}
+{{- end -}}