Set clickhouse values failed

[yulinXu]

https://github.com/deepflowio/deepflow-charts/tree/v6.2.6

helm template --set global.storageClass=longhorn --set clickhouse.storageConfig.persistence[0].size=1Gi .> xxx.yaml
Error: template: deepflow/charts/clickhouse/templates/statefulset.yaml:120:6: executing "deepflow/charts/clickhouse/templates/statefulset.yaml" at <include "persistentVolumeClaim" .>: error calling include: template: deepflow/charts/clickhouse/templates/_volumeClaimTemplates.tpl:16:24: executing "persistentVolumeClaim" at <$volume.storageClass>: wrong type for value; expected string; got interface {}

helm version
version.BuildInfo{Version:"v3.12.2", GitCommit:"1e210a2c8cc5117d1055bfaa5d40f51bbc2e345e", GitTreeState:"clean", GoVersion:"go1.20.5"}