Config check results in panic

[Hipska]

Relevant telegraf.conf

[[inputs.mem]]

Logs from Telegraf

2025-01-14T10:26:14Z I! Loading config: test.conf
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xcd9ed9]

System info

Telegraf 1.33.1 (git: HEAD@44f3a504)

Docker

No response

Steps to reproduce

Run telegraf config check --config test.conf.

Expected behavior

Telegraf validating or invalidating the config file.

Actual behavior

Panic when the file does not include this

[agent]
  skip_processors_after_aggregators = false

This blocks anyone who has this validation in their configuration management systems (Ansible, Puppet, Mgmt Config, …)

Additional info

goroutine 1 [running]:
github.com/influxdata/telegraf/agent.(*Agent).InitPlugins(0xc00228f518)
	/go/src/github.com/influxdata/telegraf/agent/agent.go:244 +0x3f9
main.getConfigCommands.func2(0xc001cef100)
	/go/src/github.com/influxdata/telegraf/cmd/telegraf/cmd_config.go:88 +0x258
github.com/urfave/cli/v2.(*Command).Run(0xc00282e420, 0xc001cef100, {0xc002811170, 0x3, 0x3})
	/go/pkg/mod/github.com/urfave/cli/[email protected]/command.go:276 +0x7e2
github.com/urfave/cli/v2.(*Command).Run(0xc00282e2c0, 0xc001ceed80, {0xc001ceedc0, 0x4, 0x4})
	/go/pkg/mod/github.com/urfave/cli/[email protected]/command.go:269 +0xa65
github.com/urfave/cli/v2.(*Command).Run(0xc00282fce0, 0xc001cee440, {0xc0001e2000, 0x5, 0x5})
	/go/pkg/mod/github.com/urfave/cli/[email protected]/command.go:269 +0xa65
github.com/urfave/cli/v2.(*App).RunContext(0xc000216000, {0xa9c9fe0, 0x11223cc0}, {0xc0001e2000, 0x5, 0x5})
	/go/pkg/mod/github.com/urfave/cli/[email protected]/app.go:333 +0x58b
github.com/urfave/cli/v2.(*App).Run(...)
	/go/pkg/mod/github.com/urfave/cli/[email protected]/app.go:307
main.runApp({0xc0001e2000, 0x5, 0x5}, {0xa923d00, 0xc0001ce020}, {0xa9582a0, 0xc00254d5d0}, {0xa9582c8, 0xc00282e160}, {0xa9c9e90, ...})
	/go/src/github.com/influxdata/telegraf/cmd/telegraf/main.go:395 +0x10d1
main.main()
	/go/src/github.com/influxdata/telegraf/cmd/telegraf/main.go:409 +0xe8