### Terraform Version ```shell Terraform v1.10.5 on linux_amd64 ``` ### Terraform Configuration Files ```terraform output "output_name" { value = transpose({ "test" = null }) } ``` ### Debug Output ``` 2025-02-20T16:16:24.710+0100 [INFO] Terraform version: 1.10.5 2025-02-20T16:16:24.710+0100 [DEBUG] using github.com/hashicorp/go-tfe v1.70.0 2025-02-20T16:16:24.710+0100 [DEBUG] using github.com/hashicorp/hcl/v2 v2.23.0 2025-02-20T16:16:24.710+0100 [DEBUG] using github.com/hashicorp/terraform-svchost v0.1.1 2025-02-20T16:16:24.710+0100 [DEBUG] using github.com/zclconf/go-cty v1.16.2 2025-02-20T16:16:24.710+0100 [INFO] Go runtime version: go1.23.3 2025-02-20T16:16:24.710+0100 [INFO] CLI args: []string{"terraform", "plan", "-refresh=false"} 2025-02-20T16:16:24.710+0100 [DEBUG] Attempting to open CLI config file: /home/bloodyfool/.terraformrc 2025-02-20T16:16:24.710+0100 [DEBUG] File doesn't exist, but doesn't need to. Ignoring. 2025-02-20T16:16:24.710+0100 [INFO] Loading CLI configuration from /home/bloodyfool/.terraform.d/credentials.tfrc.json 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory terraform.d/plugins 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory /home/bloodyfool/.terraform.d/plugins 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory /home/bloodyfool/.local/share/terraform/plugins 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory /usr/share/i3-gnome/terraform/plugins 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory /usr/share/gnome/terraform/plugins 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory /usr/local/share/terraform/plugins 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory /usr/share/terraform/plugins 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory /var/lib/snapd/desktop/terraform/plugins 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory /home/bloodyfool/.nix-profile/share/terraform/plugins 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory /nix/var/nix/profiles/default/share/terraform/plugins 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory /home/bloodyfool/.nix-profile/share/terraform/plugins 2025-02-20T16:16:24.710+0100 [DEBUG] ignoring non-existing provider search directory /nix/var/nix/profiles/default/share/terraform/plugins 2025-02-20T16:16:24.710+0100 [INFO] CLI command args: []string{"plan", "-refresh=false"} 2025-02-20T16:16:24.711+0100 [DEBUG] checking for provisioner in "." 2025-02-20T16:16:24.711+0100 [DEBUG] checking for provisioner in "/home/bloodyfool/bin" 2025-02-20T16:16:24.711+0100 [INFO] backend/local: starting Plan operation 2025-02-20T16:16:24.711+0100 [DEBUG] Building and walking validate graph 2025-02-20T16:16:24.711+0100 [DEBUG] ReferenceTransformer: "output.output_name (expand)" references: [] 2025-02-20T16:16:24.711+0100 [DEBUG] Starting graph walk: walkValidate 2025-02-20T16:16:24.712+0100 [ERROR] vertex "output.output_name" error: Error in function call 2025-02-20T16:16:24.712+0100 [ERROR] vertex "output.output_name (expand)" error: Error in function call ╷ │ Error: Error in function call │ │ on main.tf line 2, in output "output_name": │ 2: value = transpose({ "test" = null }) │ ├──────────────── │ │ while calling transpose(values) │ │ Call to function "transpose" failed: panic in function implementation: can't use ElementIterator on null value │ goroutine 72 [running]: │ runtime/debug.Stack() │ runtime/debug/stack.go:26 +0x5e │ github.com/zclconf/go-cty/cty/function.errorForPanic(...) │ github.com/zclconf/go-cty@v1.16.2/cty/function/error.go:44 │ github.com/zclconf/go-cty/cty/function.Function.Call.func2() │ github.com/zclconf/go-cty@v1.16.2/cty/function/function.go:349 +0x9b │ panic({0x3050ca0?, 0x3ddb130?}) │ runtime/panic.go:785 +0x132 │ github.com/zclconf/go-cty/cty.Value.ElementIterator({{{0x3e21418?, 0xc0007f76f0?}}, {0x0?, 0x0?}}) │ github.com/zclconf/go-cty@v1.16.2/cty/value_ops.go:1219 +0xbe │ github.com/hashicorp/terraform/internal/lang/funcs.init.func19({0xc0009a19a0?, 0xc0007f7740?, 0x3198f00?}, {{0x3e21248?, 0xc00058fb70?}}) │ github.com/hashicorp/terraform/internal/lang/funcs/collection.go:585 +0x20d │ github.com/zclconf/go-cty/cty/function.Function.Call({0x3e21210?}, {0xc0009a19a0, 0x1, 0x1}) │ github.com/zclconf/go-cty@v1.16.2/cty/function/function.go:353 +0x6bf │ github.com/hashicorp/hcl/v2/hclsyntax.(*FunctionCallExpr).Value(0xc0009c0000, 0xc0007f38a8) │ github.com/hashicorp/hcl/v2@v2.23.0/hclsyntax/expression.go:528 +0x1acf │ github.com/hashicorp/terraform/internal/lang.(*Scope).EvalExpr(0xc0003a4d80, {0x3e21828, 0xc0009c0000}, {{0x3e21918?, 0x5a441a0?}}) │ github.com/hashicorp/terraform/internal/lang/eval.go:179 +0x1a5 │ github.com/hashicorp/terraform/internal/terraform.(*BuiltinEvalContext).EvaluateExpr(0x0?, {0x3e21828, 0xc0009c0000}, {{0x3e21918?, 0x5a441a0?}}, {0x0?, 0x0?}) │ github.com/hashicorp/terraform/internal/terraform/eval_context_builtin.go:331 +0xab │ github.com/hashicorp/terraform/internal/terraform.(*NodeApplyableOutput).Execute(0xc0005ea600, {0x3e48f38, 0xc000124700}, 0x50?) │ github.com/hashicorp/terraform/internal/terraform/node_output.go:439 +0x6dc │ github.com/hashicorp/terraform/internal/terraform.(*ContextGraphWalker).Execute(0xc0009fa000, {0x3e48f38, 0xc000124700}, {0x7c044224bb68, 0xc0005ea600}) │ github.com/hashicorp/terraform/internal/terraform/graph_walk_context.go:161 +0xb5 │ github.com/hashicorp/terraform/internal/terraform.(*Graph).walk.func1({0x3534740, 0xc0005ea600}) │ github.com/hashicorp/terraform/internal/terraform/graph.go:143 +0x7c3 │ github.com/hashicorp/terraform/internal/dag.(*Walker).walkVertex(0xc0009b9800, {0x3534740, 0xc0005ea600}, 0xc0007faec0) │ github.com/hashicorp/terraform/internal/dag/walk.go:384 +0x2d1 │ created by github.com/hashicorp/terraform/internal/dag.(*Walker).Update in goroutine 70 │ github.com/hashicorp/terraform/internal/dag/walk.go:307 +0xfb3 │ . ╵ ``` ### Expected Behavior No Panic ### Actual Behavior Panic ### Steps to Reproduce `terraform plan` ### Additional Context _No response_ ### References _No response_ ### Generative AI / LLM assisted development? _No response_