So, it seems that BungeeCord made some changes to ServerInfo that broke the SubServers apps that are based on it this week. This revision serves to remedy that issue. The solution came with some quirks, though.
Versions of SubServers older than this one will not be able to run on versions of BungeeCord above #1444.
Versions of SubServers like this one and newer will not be able to run on versions of BungeeCord below #1445.
The current version of SubServers as of this writing is 2.15a/rv2
Unfortunately, this is pretty much the only solution due to the nature of the changes this time. However, with the wide range of Minecraft versions supported by BungeeCord and it's various forks, updating shouldn't be huge a problem in the future.
Revision versions of SubServers typically offer an important fix or two and nothing more, while retaining 100% compatibility with the previous version.
This revision applies only to SubServers.Bungee and SubServers.Sync.