Failure to retrieve annotations for some PDBs using pdb.annotate

I am trying to retrieve information on a list of PDBs and while most work several fail all with the same cryptic error - for example:

pdb_list = c("5FWI")
anno <- pdb.annotate(pdb_list)

Results in

Error in split.default(X, group) : first argument must be a vector

Output of sessionInfo():

R version 3.6.3 (2020-02-29)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 20.04.2 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/liblapack.so.3

locale:
 [1] LC_CTYPE=en_GB.UTF-8       LC_NUMERIC=C               LC_TIME=en_GB.UTF-8       
 [4] LC_COLLATE=en_GB.UTF-8     LC_MONETARY=en_GB.UTF-8    LC_MESSAGES=en_GB.UTF-8   
 [7] LC_PAPER=en_GB.UTF-8       LC_NAME=C                  LC_ADDRESS=C              
[10] LC_TELEPHONE=C             LC_MEASUREMENT=en_GB.UTF-8 LC_IDENTIFICATION=C       

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

other attached packages:
[1] dplyr_1.0.7 bio3d_2.4-2

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.2       rstudioapi_0.11  magrittr_1.5     tidyselect_1.1.0 R6_2.4.0        
 [6] rlang_0.4.11     fansi_0.4.1      httr_1.4.2       blob_1.2.1       tools_3.6.3     
[11] parallel_3.6.3   grid_3.6.3       xfun_0.12        tinytex_0.20     utf8_1.1.4      
[16] DBI_1.1.0        ellipsis_0.3.2   assertthat_0.2.1 tibble_3.0.3     lifecycle_1.0.0 
[21] crayon_1.3.4     purrr_0.3.4      vctrs_0.3.8      curl_4.3         glue_1.4.1      
[26] compiler_3.6.3   pillar_1.6.1     generics_0.0.2   jsonlite_1.6     pkgconfig_2.0.2

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