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opentui: fatal: undefined is not an object (evaluating 'lines().length') #4372
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bugSomething isn't workingSomething isn't workingopentuiThis relates to changes in v1.0, now that opencode uses opentuiThis relates to changes in v1.0, now that opencode uses opentui
Description
Description
Was working with agent workflows including subagents when it threw this error.
TypeError: undefined is not an object (evaluating 'lines().length')
at <anonymous> (src/cli/cmd/tui/routes/session/index.tsx:1616:25)
at runComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:742:22)
at updateComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:724:3)
at readSignal (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:660:67)
at <anonymous> (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:1508:36)
at <anonymous> (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:1144:20)
at runComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:742:22)
at updateComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:724:3)
at createMemo (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:273:10)
at untrack (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:475:12)
at runComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:742:22)
at updateComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:724:3)
at devComponent (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:593:3)
at <anonymous> (src/cli/cmd/tui/routes/session/index.tsx:1638:24)
at render (src/cli/cmd/tui/routes/session/index.tsx:1670:14)
at untrack (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:475:12)
at runComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:742:22)
at updateComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:724:3)
at createMemo (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:273:10)
at untrack (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:475:12)
at runComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:742:22)
at updateComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:724:3)
at devComponent (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:593:3)
at <anonymous> (src/cli/cmd/tui/routes/session/index.tsx:1388:24)
at runComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:742:22)
at updateComputation (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:724:3)
at runTop (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:833:7)
at runQueue (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:904:42)
at completeUpdates (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:860:84)
at runUpdates (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/dist/dev.js:850:5)
at setStore (../../node_modules/.bun/solid-js@1.9.9/node_modules/solid-js/store/dist/dev.js:221:5)
at <anonymous> (src/cli/cmd/tui/context/sync.tsx:124:15)
at emit (../../node_modules/.bun/@solid-primitives+event-bus@1.1.2+820208fac86deffb/node_modules/@solid-primitives/event-bus/dist/eventBus.js:6:13)
at emit (../../node_modules/.bun/@solid-primitives+event-bus@1.1.2+820208fac86deffb/node_modules/@solid-primitives/event-bus/dist/emitter.js:92:20)
at <anonymous> (src/cli/cmd/tui/context/sdk.tsx:20:17)
at processTicksAndRejections (native:7:39)...
OpenCode version
1.0.65
Steps to reproduce
build a custom agent that then calls subagents. The agent are defined via markdown and are a few hundred lines each. Also have an AGENTS.md thats 2500 lines.
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Operating System
macOS 26.1
Terminal
Ghostty v1.2.3
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bugSomething isn't workingSomething isn't workingopentuiThis relates to changes in v1.0, now that opencode uses opentuiThis relates to changes in v1.0, now that opencode uses opentui
Activity
rekram1-node commentedon Nov 16, 2025
does this happen on latest? it may be fixed
R44VC0RP commentedon Jan 24, 2026
Closing as duplicate of #4254 - same
lines().lengthundefined error.