Plugin is crashing on apply

[Asiya-Yunusa]

WHAT

I want to create an application using the provider but I am getting a plugin crash error

WHY

terraform {
required_providers {
spinnaker = {
source = "mercari/spinnaker"
version = "0.3.0"
}
}
}

provider "spinnaker" {
gate_endpoint = "XXX"
default_headers = "XXX"
ignore_cert_errors = true
}

resource "spinnaker_application" "my_app" {
name = "terraform-app"
email = "XXX"
}

spinnaker_application.my_app: Creating...
╷
│ Error: Plugin did not respond
│
│ with spinnaker_application.my_app,
│ on provider.tf line 16, in resource "spinnaker_application" "my_app":
│ 16: resource "spinnaker_application" "my_app" {
│
│ The plugin encountered an error, and failed to respond to the plugin.(*GRPCProvider).ApplyResourceChange call. The plugin logs may contain more details.
╵

Stack trace from the terraform-provider-spinnaker_v0.3.0 plugin:

panic: interface conversion: interface {} is nil, not string

goroutine 84 [running]:
github.com/mercari/terraform-provider-spinnaker/spinnaker/api.CreateApplication(0xc0003a83f0, 0xc00076b050, 0x0, 0x0)
github.com/mercari/terraform-provider-spinnaker/spinnaker/api/application.go:145 +0x547
github.com/mercari/terraform-provider-spinnaker/spinnaker.resourceSpinnakerApplicationCreate(0xf9e020, 0xc00076c240, 0xc000822200, 0xd9ae20, 0xc0003a83f0, 0xc000768b20, 0xacc86a, 0xc000691fe0)
github.com/mercari/terraform-provider-spinnaker/spinnaker/resource_application.go:105 +0x10d
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*Resource).create(0xc000318780, 0xf9dfa0, 0xc0005169c0, 0xc000822200, 0xd9ae20, 0xc0003a83f0, 0x0, 0x0, 0x0)
github.com/hashicorp/terraform-plugin-sdk/v2@v2.4.0/helper/schema/resource.go:285 +0x1ea
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*Resource).Apply(0xc000318780, 0xf9dfa0, 0xc0005169c0, 0xc0003b4310, 0xc000691fe0, 0xd9ae20, 0xc0003a83f0, 0x0, 0x0, 0x0, ...)
github.com/hashicorp/terraform-plugin-sdk/v2@v2.4.0/helper/schema/resource.go:396 +0x65b
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*GRPCProviderServer).ApplyResourceChange(0xc000121780, 0xf9dfa0, 0xc0005169c0, 0xc000764820, 0xc0005169c0, 0x0, 0xfa8f40)
github.com/hashicorp/terraform-plugin-sdk/v2@v2.4.0/helper/schema/grpc_provider.go:955 +0x8cf
github.com/hashicorp/terraform-plugin-go/tfprotov5/server.(*server).ApplyResourceChange(0xc00041b920, 0xf9dfa0, 0xc0005169c0, 0xc0003b4070, 0xc00041b920, 0xc00035eab0, 0xc0007feba0)
github.com/hashicorp/terraform-plugin-go@v0.2.0/tfprotov5/server/server.go:331 +0xae
github.com/hashicorp/terraform-plugin-go/tfprotov5/internal/tfplugin5._Provider_ApplyResourceChange_Handler(0xe37fe0, 0xc00041b920, 0xf9e060, 0xc00035eab0, 0xc000681c20, 0x0, 0xf9e060, 0xc00035eab0, 0xc000396a00, 0x137)
github.com/hashicorp/terraform-plugin-go@v0.2.0/tfprotov5/internal/tfplugin5/tfplugin5_grpc.pb.go:380 +0x214
google.golang.org/grpc.(*Server).processUnaryRPC(0xc0001f2700, 0xfa6dc0, 0xc000001e00, 0xc000370500, 0xc0003f2ba0, 0x146c8a0, 0x0, 0x0, 0x0)
google.golang.org/grpc@v1.34.0/server.go:1210 +0x522
google.golang.org/grpc.(*Server).handleStream(0xc0001f2700, 0xfa6dc0, 0xc000001e00, 0xc000370500, 0x0)
google.golang.org/grpc@v1.34.0/server.go:1533 +0xd05
google.golang.org/grpc.(*Server).serveStreams.func1.2(0xc000290190, 0xc0001f2700, 0xfa6dc0, 0xc000001e00, 0xc000370500)
google.golang.org/grpc@v1.34.0/server.go:871 +0xa5
created by google.golang.org/grpc.(*Server).serveStreams.func1
google.golang.org/grpc@v1.34.0/server.go:869 +0x1fd

Error: The terraform-provider-spinnaker_v0.3.0 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.