Error on every agent.

Description

I get an error when sending prompts, for every agent when using the TUI. When sending a prompt the TUI shows a message: "Unexpected server error. Check server logs for details."

On the opencode.log file there this error:

timestamp=2026-09-17T15:40:58.992Z level=ERROR run=266a2bd8 message=failed ref=err_896227d4 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)"

Plugins

No response

OpenCode version

1.18.30

Steps to reproduce

1. Open opencode.
2. Try to send a prompt

Screenshot and/or share link

Operating System

Linux 6.18.52 #1-NixOS SMP PREEMPT_DYNAMIC Mon Sep 14 11:36:19 UTC 2026 x86_64 GNU/Linux

Terminal

Ghostty