segmentation violation on startup

[dvanherbergen]

When using hierarchical paths in static roles, vault no longer starts up and gets a segmentation violation:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x6bac4a9]
goroutine 1234 [running]:
github.com/hashicorp/vault-plugin-secrets-openldap.(*backend).populateQueue(0xc0052d7000, {0xc9c2af8, 0xc007a7e0f0}, {0xc9c2f90, 0xc005412d00})
/home/runner/go/pkg/mod/github.com/hashicorp/vault-plugin-secrets-openldap@v0.12.1/rotation.go:67 +0x449
github.com/hashicorp/vault-plugin-secrets-openldap.(*backend).initQueue(0xc0052d7000, {0xc9c2af8?, 0xc007a7e0f0}, 0xc008508430)
/home/runner/go/pkg/mod/github.com/hashicorp/vault-plugin-secrets-openldap@v0.12.1/rotation.go:461 +0x10e
created by github.com/hashicorp/vault-plugin-secrets-openldap.(*backend).initialize in goroutine 1211
/home/runner/go/pkg/mod/github.com/hashicorp/vault-plugin-secrets-openldap@v0.12.1/backend.go:92 +0xf7

This happens in both version 0.12.1 and 0.13.0:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x6fd496d]
goroutine 1156 [running]:
github.com/hashicorp/vault-plugin-secrets-openldap.(*backend).populateQueue(0xc0030a4600, {0xd037178, 0xc0053d9540}, {0xd037610, 0xc003f71e80})
/home/runner/go/pkg/mod/github.com/hashicorp/vault-plugin-secrets-openldap@v0.13.0/rotation.go:67 +0x42d
github.com/hashicorp/vault-plugin-secrets-openldap.(*backend).initQueue(0xc0030a4600, {0xd037178, 0xc0053d9540}, 0xc00681f7d0)
/home/runner/go/pkg/mod/github.com/hashicorp/vault-plugin-secrets-openldap@v0.13.0/rotation.go:461 +0x107
created by github.com/hashicorp/vault-plugin-secrets-openldap.(*backend).initialize in goroutine 1177
/home/runner/go/pkg/mod/github.com/hashicorp/vault-plugin-secrets-openldap@v0.13.0/backend.go:101 +0xe8

[dvanherbergen]

Same problem as described here: #112

[fairclothjm]

Closed by #115