SIGSEV when checking if a valid config is in fact valid

[dmgeurts-mm]

Relevant telegraf.conf

n/a

Logs from Telegraf

$ sudo telegraf config check
2025-02-05T16:55:49Z I! Loading config: /etc/telegraf/telegraf.conf
2025-02-05T16:55:49Z W! DeprecationWarning: Value "false" for option "ignore_protocol_stats" of plugin "inputs.net" deprecated since version 1.27.3 and will be removed in 1.36.0: use the 'inputs.nstat' plugin instead for protocol stats
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xcd9ed9]

goroutine 1 [running]:
github.com/influxdata/telegraf/agent.(*Agent).InitPlugins(0xc00224d518)
        /go/src/github.com/influxdata/telegraf/agent/agent.go:244 +0x3f9
main.getConfigCommands.func2(0xc0020822c0)
        /go/src/github.com/influxdata/telegraf/cmd/telegraf/cmd_config.go:88 +0x258
github.com/urfave/cli/v2.(*Command).Run(0xc00274c840, 0xc0020822c0, {0xc0027a2cd0, 0x1, 0x1})
        /go/pkg/mod/github.com/urfave/cli/[email protected]/command.go:276 +0x7e2
github.com/urfave/cli/v2.(*Command).Run(0xc00274c6e0, 0xc001f53640, {0xc0022fcbc0, 0x2, 0x2})
        /go/pkg/mod/github.com/urfave/cli/[email protected]/command.go:269 +0xa65
github.com/urfave/cli/v2.(*Command).Run(0xc0027962c0, 0xc001e00200, {0xc0000b4ea0, 0x3, 0x3})
        /go/pkg/mod/github.com/urfave/cli/[email protected]/command.go:269 +0xa65
github.com/urfave/cli/v2.(*App).RunContext(0xc00004d400, {0xa9c9fe0, 0x11223cc0}, {0xc0000b4ea0, 0x3, 0x3})
        /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({0xc0000b4ea0, 0x3, 0x3}, {0xa923d00, 0xc0000e6028}, {0xa9582a0, 0xc000236b50}, {0xa9582c8, 0xc00274c580}, {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

System info

Ubuntu 22.04

Docker

n/a

Steps to reproduce

1. Install telegraf
2. Run it successfully
3. Test if the config is okay: sudo telegraf config check
   ...

Expected behavior

No SIGSEV error when checking a configuration file is valid.

Actual behavior

SIGSEV error as shown

Additional info

Telegraf 1.33.1 (git: HEAD@44f3a504)