"id = " generating errors in lmtp_tmle()

[joshua-nugent]

Describe the issue
Error messages arising when using the "id" option in lmtp_tmle().

reprex

library(lmtp)

# Start with documentation example
set.seed(56)
n <- 1000
W <- rnorm(n, 10, 5)
A <- 23 + 5*W + rnorm(n)
Y <- 7.2*A + 3*W + rnorm(n)

policy <- function(data, x) {
  (data[[x]] > 80)*(data[[x]] - 15) + (data[[x]] <= 80)*data[[x]]
}

e0 <- data.frame(W, A, Y)
# This works fine, as per example in the documentation
lmtp_tmle(
  data = e0,
  "A", "Y", "W", shift = policy,
  outcome_type = "continuous",
  intervention_type = "mtp"
)

n_clusters <- 4
set.seed(1)
e1 <- data.frame(W, A, Y, CL = rep(1:n_clusters, each = n / n_clusters))

lmtp_tmle( # folds < clusters
  data = e1, "A", "Y", "W", shift = policy,
  outcome_type = "continuous", .SL_folds = 2,
  intervention_type = "mtp", id = "CL",
)

lmtp_tmle( # folds = clusters
  data = e1, "A", "Y", "W", shift = policy,
  outcome_type = "continuous", .SL_folds = 4,
  intervention_type = "mtp", id = "CL",
)

lmtp_tmle( # folds > clusters
  data = e1, "A", "Y", "W", shift = policy,
  outcome_type = "continuous", .SL_folds = 10,
  intervention_type = "mtp", id = "CL",
)

More information on how and why to use a reprex can be found here.

Expected behavior
Larger standard errors than when using same data without "id" option.

Please include your R session info:

R version 4.1.1 (2021-08-10)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Big Sur 11.6

Matrix products: default
LAPACK: /Library/Frameworks/R.framework/Versions/4.1/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] lmtp_1.0.0

loaded via a namespace (and not attached):
 [1] compiler_4.1.1      generics_0.1.0      nnls_1.4           
 [4] tools_4.1.1         SuperLearner_2.0-28 codetools_0.2-18   
 [7] splines_4.1.1       gam_1.20            data.table_1.14.2  
[10] iterators_1.0.13    foreach_1.5.1 

And lastly, please be kind and respectful 😄

Thanks for your work on this!