Stack trace from the terraform-provider-github_v6.6.0 plugin:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0xc69f0d]

goroutine 44 [running]:
github.com/integrations/terraform-provider-github/v6/github.resourceGithubOrganizationRulesetRead(0xc00059c000, {0xd352c0?, 0xc000380840?})
        github.com/integrations/terraform-provider-github/v6/github/resource_github_organization_ruleset.go:560 +0x56d
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*Resource).read(0x107d470?, {0x107d470?, 0xc0008dc840?}, 0xd?, {0xd352c0?, 0xc000380840?})
        github.com/hashicorp/terraform-plugin-sdk/v2@v2.34.0/helper/schema/resource.go:811 +0x15f
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*Resource).RefreshWithoutUpgrade(0xc0003bbdc0, {0x107d470, 0xc0008dc840}, 0xc000991ad0, {0xd352c0, 0xc000380840})
        github.com/hashicorp/terraform-plugin-sdk/v2@v2.34.0/helper/schema/resource.go:1117 +0x529
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*GRPCProviderServer).ReadResource(0xc000141d58, {0x107d470?, 0xc0008dc780?}, 0xc00084aa80)
        github.com/hashicorp/terraform-plugin-sdk/v2@v2.34.0/helper/schema/grpc_provider.go:708 +0x6c5
github.com/hashicorp/terraform-plugin-go/tfprotov5/tf5server.(*server).ReadResource(0xc0001646e0, {0x107d470?, 0xc0008c7f20?}, 0xc00022c2a0)
        github.com/hashicorp/terraform-plugin-go@v0.23.0/tfprotov5/tf5server/server.go:783 +0x309
github.com/hashicorp/terraform-plugin-go/tfprotov5/internal/tfplugin5._Provider_ReadResource_Handler({0xee16c0, 0xc0001646e0}, {0x107d470, 0xc0008c7f20}, 0xc00078ed00, 0x0)
        github.com/hashicorp/terraform-plugin-go@v0.23.0/tfprotov5/internal/tfplugin5/tfplugin5_grpc.pb.go:482 +0x1a6
google.golang.org/grpc.(*Server).processUnaryRPC(0xc00039c000, {0x107d470, 0xc0008c7e90}, {0x1081d68, 0xc00027e300}, 0xc0008d0900, 0xc000463890, 0x1719528, 0x0)
        google.golang.org/grpc@v1.63.2/server.go:1369 +0xdf8
google.golang.org/grpc.(*Server).handleStream(0xc00039c000, {0x1081d68, 0xc00027e300}, 0xc0008d0900)
        google.golang.org/grpc@v1.63.2/server.go:1780 +0xe8b
google.golang.org/grpc.(*Server).serveStreams.func2.1()
        google.golang.org/grpc@v1.63.2/server.go:1019 +0x8b
created by google.golang.org/grpc.(*Server).serveStreams.func2 in goroutine 25
        google.golang.org/grpc@v1.63.2/server.go:1030 +0x125

Error: The terraform-provider-github_v6.6.0 plugin crashed!

This is always indicative of a bug within the plugin. It would be immensely
helpful if you could report the crash with the plugin's maintainers so that it
can be fixed. The output above should help diagnose the issue.