[6.5.1-rc5] Unable to add docker from existing template.

When attempting to add a container in docker, the following errors appear in the JS console in Firefox

The connection to https://unraidServer/sub/var was interrupted while the page was loading.
dynamix.js:34:10380
TypeError: container is null[Learn More]
AddContainer:424:22
makeAllocations
https://unraidServer/Docker/AddContainer:424:22
<anonymous>
https://unraidServer/Docker/AddContainer:1247:34
i
https://unraidServer/webGui/javascript/dynamix.js:4:27146
fireWith
https://unraidServer/webGui/javascript/dynamix.js:4:27914
ready
https://unraidServer/webGui/javascript/dynamix.js:4:29705
J
https:///webGui/javascript/dynamix.js:4:29890

Upon clicking on the lick to add the container, I get a white screen with nothing being done.