ERROR fatal.nim(54) when fetching /rss
When fetching about 100 RSS feeds in a few seconds, the following error is sent 2-10 times:
```
ERROR fatal.nim(54)            sysFatal
asyncfutures.nim(389)    read
asyncfutures.nim(389)    read
asyncfutures.nim(389)    read
index 0 not in 1 .. 12
```
I set `tokenCount = 10`, `redisMaxConnections = 200` and `rssMinutes = 0`.
Most requests resolve successfully though. Does anyone know what is causing this / how to fix it? Thanks!