What steps will reproduce the problem?

1.5.7 Classic, appear one BUG as follows：
...s\ShestakUI\Libs\LibHealComm-4.0\LibHealComm-4.0.lua:2831: table index is nil
Count: 1

Call Stack:
[string "=[C]"]: ?
[string "@AddOns\ShestakUI\Libs\LibHealComm-4.0\LibHealComm-4.0.lua"]:2831: in main chunk

Thanks. I'll take a look at this. It's related to an update to LibHealComm intended for the incoming Wrath Classic.

Should be resolved in 8c3af1e. Will push an update for version 1.5.8 that should address this.