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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchAngular error NG0750 means an @defer block could not load its deferred dependencies and has no @error block configured to show a failure state. Add that fallback in the template, then inspect the failed JavaScript request and confirm the dependencies are eligible for deferral.
What NG0750 means
Angular’s diagnostic is “@defer dependencies failed to load.” It occurs when loading dependencies for an @defer block fails and the block does not define an @error handler. Angular describes poor network conditions as a typical cause, but the error alone does not identify the cause in a particular app. See the NG0750 error reference.
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An @error block handles failure to load the deferred dependencies. It does not handle failures in API calls or other application behavior after the deferred component has loaded.
Add an error state to the defer block
Place an optional @error block alongside the other states for the affected @defer block. Keep its content simple: dependencies used by the error block are loaded eagerly, so the fallback should not rely on the same deferred content that just failed.
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@defer (on viewport) {
<app-heavy-panel />
} @placeholder {
<p>Scroll to load the panel.</p>
} @loading {
<p>Loading panel…</p>
} @error {
<p>The panel could not be loaded. Check your connection and try again.</p>
}The message is only a fallback; it does not itself retry the failed imports. If recovery requires retrying, provide an application-controlled action and ensure it causes a meaningful retry rather than simply repeating the same failed state.
Trace the failed deferred request
- Find the affected block. Identify which UI area corresponds to the
@deferblock, and add an@errorstate if it is missing. - Inspect browser network activity. Reproduce the failure and look for the JavaScript request associated with the deferred content. Check whether it failed, was blocked, or could not be reached.
- Review deployment conditions. Compare the requested deferred file with the files available from the deployed application. A request failure can have causes beyond network quality; NG0750 by itself does not distinguish among them.
- Check eligibility rules. Verify that the dependencies you expect to defer meet Angular’s rules below. Dependencies that are not eligible may be included eagerly instead of becoming separate deferred imports.
Angular compiles eligible deferred dependencies into dynamic imports, and the main block renders after those imports resolve. The deferred loading guide explains the import behavior and eligibility rules.
Confirm what Angular can defer
Angular can defer a component, directive, or pipe only when it is standalone and is not referenced outside the @defer block in the same file. References elsewhere in that file include uses such as a ViewChild query. Dependencies that fail these rules are loaded eagerly. Transitive dependencies can still be NgModule-based.
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- Search the same file for other references to those symbols, including queries.
- Remember that an eagerly loaded dependency does not become deferred just because it appears inside the block.
Review loading and prefetch timing
By default, an @defer block’s trigger is browser idle. A configured trigger changes when Angular starts loading the deferred content. A prefetch trigger can start fetching dependencies before the content trigger fires, making them available sooner; it does not change the failure-state role of @error.
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Angular also supports @placeholder and @loading states. Dependencies used in those blocks are eager, as are dependencies in @error. Choose lightweight state content where possible so the fallback UI does not add unnecessary work to the initial load.
Test the failure state
For automated coverage, Angular’s TestBed defer-block APIs let tests control defer-block states manually. Use them to verify that the expected fallback appears when deferred loading fails, and that the normal content appears in the loaded state. See the testing guidance in the Angular deferred loading guide.
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Deferred content and its triggers behave differently during server-side rendering and static site generation. By default, the server renders the placeholder or nothing, while triggers activate on the client. Angular documents Incremental Hydration configuration for cases where the main deferred content should render on the server.
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