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Angular’s NG0205: Injector has already been destroyed means code tried to retrieve a service from an injector after its owning scope had been destroyed. The usual culprit is work that outlives a component—such as a timer callback, promise continuation, or Observable subscription. Use the stack trace to find the access, then either stop that work when its owner is destroyed or give it a longer-lived owner.
What NG0205 means
Angular describes NG0205 as an attempt to retrieve a service from an injector that has already been destroyed. A component, directive, or module may have been destroyed while code associated with it continued running. The error is about accessing a destroyed injector, not simply about a service being unavailable. See Angular’s NG0205 error reference.
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Find what outlived its owner
- Start at the failing stack location. The stack trace identifies where the destroyed injector was accessed. Trace backward from that call to the callback or operation that led to it.
- Look for work that can run later. Check timers, promise continuations, Observable subscriptions, and cleanup code. Ask whether navigation, conditional rendering, or another lifecycle event could destroy the component before that work runs.
- Inspect teardown timing. Cleanup that tries to retrieve services while an injector or its providers are already being destroyed can also fail. Avoid obtaining dependencies from an injector during teardown.
- Keep dependencies available to the code that needs them. Capture services during class construction, for example in injected class fields, rather than trying to retrieve them from an injector later inside asynchronous code.
Angular’s error reference demonstrates both a delayed callback and service access during ngOnDestroy. The key question is whether the operation is still valid at the time it runs, and whether its dependency scope still exists.
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For Observable subscriptions
Use takeUntilDestroyed when a subscription should end with its Angular lifecycle context. Without an argument, Angular injects the current DestroyRef; outside an injection context, pass the intended reference explicitly. The API is documented as stable since Angular v19.0, so confirm that the installed project version supports it. See Angular’s takeUntilDestroyed API reference.
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For other cleanup callbacks
Use DestroyRef.onDestroy(callback) to register general cleanup with the relevant lifecycle scope. Angular runs the callback when that scope is destroyed; the registration returns a function that can unregister the callback. A component or directive’s reference follows that instance, while a reference injected elsewhere follows its corresponding injector. Check DestroyRef.destroyed when a callback may run after the relevant instance has ended. See Angular’s DestroyRef API reference.
For work that should outlive a component
If work legitimately continues after a view disappears, its ownership should also outlive that view. Move the work and the dependencies it needs to a longer-lived service or injector, or guard view-specific actions with the relevant DestroyRef.destroyed state. Do not move work to application scope merely to suppress the error; choose an owner whose lifetime matches the intended work.
NG0205 is different from NG0203
NG0203 concerns calling inject() outside an injection context. Angular permits inject() only in specific contexts, such as class construction and provider factories; lifecycle hooks such as ngOnInit, ngAfterViewInit, and ngOnDestroy are not valid injection contexts. NG0205, by contrast, means code attempted to use an injector that had already been destroyed. Lifecycle code can expose either problem, so use the exact error and failing operation to guide the diagnosis. See Angular’s DI debugging and troubleshooting guide.
How to choose the lifecycle owner
- Observable tied to a view: end its subscription with
takeUntilDestroyedusing the view’s context. - General component cleanup: register it with that component’s
DestroyRef. - Work owned by a broader provider scope: use the corresponding injector’s lifecycle, not a component’s.
- Work that must continue after a view closes: place it under an owner that remains alive and avoid acting on destroyed view-specific dependencies.
A DestroyableInjector is an injector its owner can destroy; destroying it triggers its DestroyRef hooks. See Angular’s DestroyableInjector API reference.
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