Crash on stopping geth w/ blsync

[s1na]

System information

Geth version: geth version 1.14.4-unstable-a6751d6f-20240603
CL client & version: e.g. blsync
OS & Version: Linux

Expected behaviour

Stops without error

Actual behaviour

Geth was running with the --beacon.api and --beacon.checkpoint flag. I wanted to stop it because the light server was not recognizing the checkpoint. The node crashed with the following log when attempting to stop:

^CINFO [06-03|13:39:02.718] Got interrupt, shutting down...
INFO [06-03|13:39:02.718] HTTP server stopped                      endpoint=127.0.0.1:8545
INFO [06-03|13:39:02.718] HTTP server stopped                      endpoint=127.0.0.1:8546
INFO [06-03|13:39:02.718] IPC endpoint closed                      url=/home/ubuntu/datadir-geth/geth.ipc                                                                                                                            panic: send on closed channel
                                                                                                                                                                                                                                     goroutine 5033 [running]:
github.com/donovanhide/eventsource.(*Stream).receiveEvents(0xc019dfb140, {0x1ff6038?, 0xc0008bb800})
        github.com/donovanhide/eventsource@v0.0.0-20210830082556-c59027999da0/stream.go:160 +0x268
github.com/donovanhide/eventsource.(*Stream).stream(0x9e2845?, {0x1ff6038?, 0xc0008bb800?})
        github.com/donovanhide/eventsource@v0.0.0-20210830082556-c59027999da0/stream.go:145 +0x68                                                                                                                                    created by github.com/donovanhide/eventsource.SubscribeWith in goroutine 4845
        github.com/donovanhide/eventsource@v0.0.0-20210830082556-c59027999da0/stream.go:79 +0x1a5

[zsfelfoldi]

Fixed in #29946