siyuan-note/siyuan · error

globalThis.Object is not an object

Error message

globalThis.Object is not an object

What it means

ObjectFreeze calls JavaScript Object.freeze() on a goja object to make it immutable inside the plugin sandbox. Before doing so it reads globalThis.Object and converts it; if the global Object constructor is missing (nil), it throws this error. This should never happen on a healthy ECMAScript runtime, so it indicates the runtime's global object has been stripped or corrupted.

Source

Thrown at kernel/plugin/sandbox.go:127

	lo.Must0(injectLogger(p, rt, siyuan))
	lo.Must0(injectStorage(p, rt, siyuan))
	lo.Must0(injectRpc(p, rt, siyuan))
	lo.Must0(injectAgent(p, rt, siyuan))
	lo.Must0(injectClient(p, rt, siyuan))
	lo.Must0(injectServer(p, rt, siyuan))
	lo.Must0(injectSecretsVars(p, rt, siyuan))

	lo.Must0(ObjectFreeze(rt, siyuan))

	lo.Must0(rt.GlobalObject().Set("siyuan", siyuan))
	return
}

// ObjectFreeze calls Object.freeze() on the given goja object.
func ObjectFreeze(rt *goja.Runtime, obj *goja.Object) error {
	Object := rt.GlobalObject().Get("Object").ToObject(rt)
	if Object == nil {
		return fmt.Errorf("globalThis.Object is not an object")
	}

	freeze, ok := goja.AssertFunction(Object.Get("freeze"))
	if !ok {
		return fmt.Errorf("globalThis.Object.freeze is not a function")
	}

	_, err := freeze(Object, obj)
	return err
}

// ObjectSeal calls Object.seal() on the given goja object.
func ObjectSeal(rt *goja.Runtime, obj *goja.Object) error {
	Object := rt.GlobalObject().Get("Object").ToObject(rt)
	if Object == nil {
		return fmt.Errorf("globalThis.Object is not an object")
	}

View on GitHub (pinned to 8641553a1f)

Solutions

  1. Ensure the goja Runtime is created with the standard global environment (do not delete or overwrite globalThis.Object)
  2. Run ObjectFreeze/injection before any plugin code that could tamper with globals, or after restoring Object
  3. Add a fallback that skips freezing when Object is unavailable, logging a warning instead of failing hard
  4. Verify with rt.GlobalObject().Get("Object") != nil before calling ObjectFreeze

Example fix

// before
plugin.ObjectFreeze(rt, siyuan) // error: globalThis.Object is not an object
// after
if rt.GlobalObject().Get("Object") == nil {
    logging.LogWarningf("skip freeze: global Object missing")
} else if err := plugin.ObjectFreeze(rt, siyuan); err != nil {
    return err
}
Defensive patterns

Strategy: type-guard

Validate before calling

if rt.GlobalObject().Get("Object") == nil {
    // skip freeze or rebuild runtime
}

Type guard

func hasGlobalObject(rt *goja.Runtime) bool {
    return rt != nil && rt.GlobalObject() != nil && rt.GlobalObject().Get("Object") != nil
}

Try / catch

if err := plugin.ObjectFreeze(rt, obj); err != nil {
    logging.LogWarningf("freeze skipped: %v", err)
}

Prevention

When it happens

Trigger: Calling ObjectFreeze on a goja Runtime whose GlobalObject() has no "Object" property — e.g. the global was replaced/deleted, the runtime was created with a minimal global template lacking Object, or Get("Object") returned a nil value that ToObject turned into nil.

Common situations: A sandbox that deliberately removed standard globals before freezing; running injection before the runtime finished constructing its global environment; custom runtime initialization code that overwrote globalThis.Object.

Understand the failure class

Background: Type mismatch errors: IllegalArgumentException, TypeError and type guards across 150 open-source libraries — this error's family across 150 libraries.

Related errors

AI-assisted analysis of siyuan-note/siyuan@8641553a1f (2026-09-11). Data as JSON: /api/errors/b91ffca2845dbe0c. Report an issue: GitHub.