telegraf crashes with panic (segmentation violation)

[hortigosa]

System info:

crashes with 1.12.1, tried upgrading to 1.12.2 with same behaviour

Debian Stretch
Proxmox PVE kernel (adapted from ubuntu)
AMD Threadripper (first gen)
128 GB RAM

No recent hardware or software updates, except telegraf version

Steps to reproduce:

Start telegraf
crashes in a couple of minutes
restarted by systemd/monit/manual
crashes in a couple of minutes
(goto 1)

Log:

2019-10-07T07:46:05Z E! [agent] Error terminating process: operation not permitted
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x30 pc=0xf191b4]
goroutine 32 [running]:
github.com/influxdata/telegraf/plugins/inputs/exec.(*Exec).ProcessCommand(0xc0005ac0c0, 0xc0001623f1, 0x64, 0x2c59780, 0xc0005aa0a0, 0xc000552110)
#11/go/src/github.com/influxdata/telegraf/plugins/inputs/exec/exec.go:164 +0x294
created by github.com/influxdata/telegraf/plugins/inputs/exec.(*Exec).Gather
#11/go/src/github.com/influxdata/telegraf/plugins/inputs/exec/exec.go:226 +0x297
telegraf.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
telegraf.service: Unit entered failed state.
telegraf.service: Failed with result 'exit-code'.
telegraf.service: Service hold-off time over, scheduling restart.
2019-10-07T07:46:30Z I! Starting Telegraf 1.12.2
2019-10-07T07:47:05Z E! [agent] Error terminating process: operation not permitted
(same behavior again and again)