pariwise_survdiff throws unusual error when a model with strata is used

[dryals]

Expected behavior

I'm attempting to analyse a survival model with strata using pariwise_survdiff

Actual behavior

pairwise_survdiff(Surv(time, status) ~ effect1 + strata(strata1), data = data)

produces the error

Error in '[.data.frame'(data, , group_var, drop = FALSE) : undefined columns selected

for reference, the same model without strata:

pairwise_survdiff(Surv(time, status) ~ effect1, data = data)

works as expected. Also, using a different function with strata

survdiff(Surv(time, status) ~ effect1 + strata(strata1), data = data)

works as expected.

Steps to reproduce the problem

attempting to fit a model using strata

pairwise_survdiff(Surv(time, status) ~ effect1 + strata(strata1), data = data)

session_info()

─ Session info ─────────────────────────────────────────────────────────────────────────────────────────────────
 setting  value
 version  R version 4.3.2 (2023-10-31)
 os       Manjaro Linux
 system   x86_64, linux-gnu
 ui       RStudio
 language (EN)
 collate  en_US.UTF-8
 ctype    en_US.UTF-8
 tz       America/Indiana/Indianapolis
 date     2024-03-14
 rstudio  2023.12.1+402 Ocean Storm (desktop)
 pandoc   3.1.8 @ /usr/bin/pandoc

─ Packages ─────────────────────────────────────────────────────────────────────────────────────────────────────
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 [1] /home/dylan/R/x86_64-pc-linux-gnu-library/4.3
 [2] /usr/lib/R/library