Server resource pack download causes game crash (with crash report) & doesn't exist on 1.12.2

When loading into the server, the resource pack fails to download and results in the clients game crashing. This same user did not get game crashes for the resource pack download in 1.12. The full crash report can be viewed at:

https://paste.gg/p/anonymous/d9f3644d3c534b71beb42985cbe6f1c1/files/883a18b66d374c2caa7a7756beaf7488/raw