Index $.Site.Data inside partial throw an error calling index: index of untyped nil

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1

I’m trying to customize date using yaml data

partials/comments_list.html

...
{{ $date := .date }}
{{ (time $date).Day }}                            
{{ $bulan := (time $date).Month }}
{{ index $.Site.Data.bulan (printf "%d" $bulan) | humanize }},
{{ (time $date).Year }}
...
{{ partial "comments_replies" (dict  "entryId_parent" $postSlug "SiteDataComments_parent" $.Site.Data.comments "parentId" ._id "parentName" .name   "context" .)  }}

as you can see in the code above {{ index $.Site.Data.bulan (printf "%d" $bulan) | humanize }} working as i expected, but when i applied the same code inside partial comment_replies it throw me an error calling index: index of untyped nil

I wonder how can i apply the index $.Site.Data.bulan inside the partial comment_replies?

the source code is here

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