Parágrafo com "XXX." causa erro

[edusantana]

Erro: /var/lib/gems/2.3.0/gems/pandoc_abnt-1.0.2/lib/pandoc_abnt/lista_filter.rb:127:in `primeiro_tolken_do_item': undefined method `[]' for nil:NilClass (NoMethodError)
	from /var/lib/gems/2.3.0/gems/pandoc_abnt-1.0.2/lib/pandoc_abnt/lista_filter.rb:80:in `block in processa_items_da_lista'
	from /var/lib/gems/2.3.0/gems/pandoc_abnt-1.0.2/lib/pandoc_abnt/lista_filter.rb:75:in `each'
	from /var/lib/gems/2.3.0/gems/pandoc_abnt-1.0.2/lib/pandoc_abnt/lista_filter.rb:75:in `processa_items_da_lista'
	from /var/lib/gems/2.3.0/gems/pandoc_abnt-1.0.2/lib/pandoc_abnt/lista_filter.rb:56:in `block in filtra_json'
	from /var/lib/gems/2.3.0/gems/pandoc_abnt-1.0.2/lib/pandoc_abnt/lista_filter.rb:54:in `each'
	from /var/lib/gems/2.3.0/gems/pandoc_abnt-1.0.2/lib/pandoc_abnt/lista_filter.rb:54:in `filtra_json'
	from /var/lib/gems/2.3.0/gems/pandoc_abnt-1.0.2/exe/pandoc_abnt:11:in `<top (required)>'
	from /usr/local/bin/pandoc_abnt:23:in `load'
	from /usr/local/bin/pandoc_abnt:23:in `<main>'
pandoc: Error running filter pandoc_abnt
Filter returned error status 1