TypeError: undefined is not an object (evaluating 'a.name') - Only happening after upgrade

[MiguVT]

Description

Saw lot of issues opened but no one provided logs cleanly, soo here it goes:

miguvt@nixos /e/nixos (main) [1]> opencode --print-logs --log-level DEBUG run "hi"
timestamp=2026-09-16T16:37:39.336Z level=INFO run=d2699f38 message="creating instance" directory=/etc/nixos
timestamp=2026-09-16T16:37:39.337Z level=INFO run=d2699f38 message=fromDirectory directory=/etc/nixos
timestamp=2026-09-16T16:37:39.359Z level=INFO run=d2699f38 message=bootstrapping directory=/etc/nixos
timestamp=2026-09-16T16:37:39.365Z level=INFO run=d2699f38 message=loading path=/home/miguvt/.config/opencode/config.json
timestamp=2026-09-16T16:37:39.366Z level=INFO run=d2699f38 message=loading path=/home/miguvt/.config/opencode/opencode.json
timestamp=2026-09-16T16:37:39.369Z level=INFO run=d2699f38 message=loading path=/home/miguvt/.config/opencode/opencode.jsonc
timestamp=2026-09-16T16:37:39.418Z level=INFO run=d2699f38 message="all LSPs are disabled"
timestamp=2026-09-16T16:37:39.419Z level=INFO run=d2699f38 message="all formatters are disabled"
timestamp=2026-09-16T16:37:39.419Z level=INFO run=d2699f38 message=init
timestamp=2026-09-16T16:37:39.499Z level=INFO run=d2699f38 message=created id=ses_f54eb3dd4ffeYaX03UHFdIWDrD slug=hidden-orchid version=1.18.30 projectID=d310466c572f92051e7d9b1b3733725e3eaa20d8 directory=/etc/nixos path="" workspaceID=undefined parentID=undefined title="New session - 2026-09-16T16:37:39.499Z" agent=undefined model=undefined metadata=undefined permission="[{\"permission\":\"question\",\"pattern\":\"*\",\"action\":\"deny\"},{\"permission\":\"plan_enter\",\"pattern\":\"*\",\"action\":\"deny\"},{\"permission\":\"plan_exit\",\"pattern\":\"*\",\"action\":\"deny\"}]" cost=0 tokens.input=0 tokens.output=0 tokens.reasoning=0 tokens.cache.read=0 tokens.cache.write=0 time.created=1789576659499 time.updated=1789576659499
timestamp=2026-09-16T16:37:39.507Z level=INFO run=d2699f38 message="event connected"
timestamp=2026-09-16T16:37:39.767Z level=INFO run=d2699f38 message=loop session.id=ses_f54eb3dd4ffeYaX03UHFdIWDrD step=0

> build · qwen3.8-27b

timestamp=2026-09-16T16:37:39.773Z level=INFO run=d2699f38 message=stream providerID=local-llama modelID=qwen3.8-27b session.id=ses_f54eb3dd4ffeYaX03UHFdIWDrD small=true agent=title mode=primary
timestamp=2026-09-16T16:37:39.781Z level=INFO run=d2699f38 message="llm runtime selected" llm.runtime=ai-sdk llm.provider=local-llama llm.model=qwen3.8-27b
timestamp=2026-09-16T16:37:39.790Z level=ERROR run=d2699f38 message="stream error" providerID=local-llama modelID=qwen3.8-27b session.id=ses_f54eb3dd4ffeYaX03UHFdIWDrD small=true agent=title mode=primary error.error="AI_APICallError: Invalid API Key"
timestamp=2026-09-16T16:37:39.797Z level=INFO run=d2699f38 message=tracking hash=647a091fe6ceca3693968f6310e72bf508b75def cwd=/etc/nixos git=/home/miguvt/.local/share/opencode/snapshot/d310466c572f92051e7d9b1b3733725e3eaa20d8/8662e97f990aad1524085c760436e71142424611
timestamp=2026-09-16T16:37:39.801Z level=INFO run=d2699f38 message="shell tool using shell" shell=/run/current-system/sw/bin/bash
timestamp=2026-09-16T16:37:39.806Z level=INFO run=d2699f38 message=init count=1
timestamp=2026-09-16T16:37:39.808Z level=ERROR run=d2699f38 message=failed ref=err_07558542 error="TypeError: undefined is not an object (evaluating 'a.name')" cause="TypeError: undefined is not an object (evaluating 'a.name')\n    at resolve (/$bunfs/root/chunk-2txybz4b.js:2:1659)\n    at a (/$bunfs/root/chunk-2txybz4b.js:2:936)\n    at map (native:1:11)\n    at <anonymous> (/$bunfs/root/chunk-2txybz4b.js:2:1626)\n    at a (/$bunfs/root/chunk-2txybz4b.js:2:1166)\n    at map (native:1:11)\n    at <anonymous> (/$bunfs/root/chunk-2txybz4b.js:2:1626)\n    at a (/$bunfs/root/chunk-2txybz4b.js:2:1166)\n    at map (native:1:11)\n    at <anonymous> (/$bunfs/root/chunk-2txybz4b.js:2:1390)\n    at SystemPrompt.environment (/$bunfs/root/chunk-bea263sy.js:50:13096)\n    at SystemPrompt.environment (definition) (/$bunfs/root/chunk-bea263sy.js:4:14254)\n    at SessionPrompt.run (/$bunfs/root/chunk-bea263sy.js:50:14576)\n    at SessionPrompt.run (definition) (/$bunfs/root/chunk-bea263sy.js:50:10099)\n    at SessionRunState.ensureRunning (/$bunfs/root/chunk-bea263sy.js:50:14545)\n    at SessionRunState.ensureRunning (definition) (/$bunfs/root/chunk-bea263sy.js:2:6720)\n    at SessionPrompt.loop (/$bunfs/root/chunk-bea263sy.js:50:9849)\n    at SessionPrompt.loop (definition) (/$bunfs/root/chunk-bea263sy.js:50:14481)\n    at SessionPrompt.prompt (/$bunfs/root/chunk-f9g4vqca.js:6:11695)\n    at SessionPrompt.prompt (definition) (/$bunfs/root/chunk-bea263sy.js:50:9462)"
Error: {
  "name": "UnknownError",
  "data": {
    "message": "Unexpected server error. Check server logs for details.",
    "ref": "err_07558542"
  }
}
timestamp=2026-09-16T16:37:39.809Z level=INFO run=d2699f38 message="disposing instance" directory=/etc/nixos
miguvt@nixos /e/nixos (main) [1]> 

While my config is:

{ pkgs, ... }:

{
  environment.systemPackages = with pkgs; [
    (llama-cpp.override { cudaSupport = true; })
    opencode
  ];

  environment.sessionVariables = {
    AI_MODELS_PATH = "/mnt/data/llamasrv/Models";
  };

  networking.firewall.allowedTCPPorts = [
    8001 # llama-server
  ];

  home-manager.users.miguvt = {
    xdg.configFile."opencode/opencode.json".text = builtins.toJSON {
      "$schema" = "https://opencode.ai/config.json";
      "provider" = {
        "local-llama" = {
          "npm" = "@ai-sdk/openai-compatible";
          "name" = "Local Llama Server";
          "options" = {
            "baseURL" = "http://127.0.0.1:8001/v1";
          };
          "models" = {
            "qwen3.8-27b" = {
              "name" = "qwen3.8-27b (local)";
            };
          };
        };
      };

      "tools" = {
        "bash" = true;
        "edit" = true;
        "write" = true;
        "read" = true;
      };
    };
  };
}

Plugins

Default

OpenCode version

1.18.30

Steps to reproduce

1. Just run opencode run "hi"

Screenshot and/or share link

https://opncd.ai/share/pF86jcEq

Operating System

NixOS Unstable

Terminal

Kitty

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• TypeError: undefined is not an object (evaluating 'a.name')" #49158: TypeError: undefined is not an object (evaluating 'a.name')
• macOS: every prompt fails with "undefined is not an object (evaluating 'a.name')" #48811: macOS: every prompt fails with "undefined is not an object (evaluating 'a.name')"
• SystemPrompt.environment crashes on every prompt: undefined is not an object (evaluating 'a.name') #48965: SystemPrompt.environment crashes on every prompt: undefined is not an object (evaluating 'a.name')
• Regression in 1.18.30: every prompt crashes with TypeError in SystemPrompt.environment ("a.name") — 1.18.18 works fine #48645: Regression in 1.18.30: every prompt crashes with TypeError in SystemPrompt.environment ("a.name") — 1.18.18 works fine
• agent list crashes with "undefined is not an object (evaluating 'a.name')" when the config has a non-empty references block #48809: agent list crashes with "undefined is not an object (evaluating 'a.name')" when the config has a non-empty references block

[MiguVT]

This issue might be a duplicate of existing issues. Please check:

* [TypeError: undefined is not an object (evaluating 'a.name')" #49158](https://github.com/anomalyco/opencode/issues/49158): TypeError: undefined is not an object (evaluating 'a.name')

* [macOS: every prompt fails with "undefined is not an object (evaluating 'a.name')" #48811](https://github.com/anomalyco/opencode/issues/48811): macOS: every prompt fails with "undefined is not an object (evaluating 'a.name')"

* [SystemPrompt.environment crashes on every prompt: undefined is not an object (evaluating 'a.name') #48965](https://github.com/anomalyco/opencode/issues/48965): SystemPrompt.environment crashes on every prompt: undefined is not an object (evaluating 'a.name')

* [Regression in 1.18.30: every prompt crashes with TypeError in SystemPrompt.environment ("a.name") — 1.18.18 works fine #48645](https://github.com/anomalyco/opencode/issues/48645): Regression in 1.18.30: every prompt crashes with TypeError in SystemPrompt.environment ("a.name") — 1.18.18 works fine

* [agent list crashes with "undefined is not an object (evaluating 'a.name')" when the config has a non-empty references block #48809](https://github.com/anomalyco/opencode/issues/48809): agent list crashes with "undefined is not an object (evaluating 'a.name')" when the config has a non-empty references block

Its true that all of them are duplicated, but all of them are just people repeating things and amking everything harder to understand, here I tried to give everything as KISS (Keep It Simple Stupid) as possible to make it easy to follow.

[GanbaruTobi]

Having the same issue

[ApprenticeofEnder]

Same thing, plus I'm using Nix too, just on Nobara linux.