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rpostgresql - Storing query result in a R object when have NULL values

I am trying a query, but some columns has null values. How can i inform r that the null values are 'NA'.

R is returnig: Error in as.POSIXlt.character(x, tz, ...) : character string is not in a standard unambiguous format

dados_obitos <- dbGetQuery(con, "SELECT 
dtobito,
dtnasc,
esc_nivel,
estciv_nivel,
horaobito,
sexo,
codidade,
validade
FROM obitos_brasil_sim.estado_civil, obitos_brasil_sim.obitos, obitos_brasil_sim.escolaridade
WHERE estado_civil.estciv = obitos.estciv AND escolaridade.esc = obitos.esc;")

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