I am running an alignment with the DECIPHER package in bioconductor using an Rstudio instance located on a server. For some reason, every time the alignment reaches 99% the r session crashes:

I have run the program repeatedly varying inputs and other factors and it always crashes in the exact same place:
Generally in the past when I've had session crashes the issue has been memory, but these are small viral genomes, which shouldn't be an issue. I also pulled all the code off the server to run in Rstudio on my personal computer, which has less RAM and CPUs, and the code ran no problem on the exact same inputs. Any ideas as to what the issue could be?