build: unhandled exception error during prerender

Command

build

Is this a regression?

Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

if route fails to prerender due to invalid http url during prerender, it gives following error, so we cannot find route having the error.

An unhandled exception occurred: Cannot read properties of undefined (reading 'stack')

Minimal Reproduction

add route with RenderMode.Prerender in new app, & call api with invalid http url in that component.
(not adding app as bug is clear in existing code, see anything else section)

Exception or Error

An unhandled exception occurred: Cannot read properties of undefined (reading 'stack')
    at /Users/***/node_modules/@angular-devkit/build-angular/node_modules/@angular/build/src/utils/server-rendering/prerender.js:153:94

Your Environment

Angular CLI: 19.2.3
Node: 22.13.1
Package Manager: yarn 4.7.0
OS: darwin arm64

Angular: 19.2.2
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, platform-server
... router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1902.3
@angular-devkit/build-angular   19.2.3
@angular-devkit/core            19.2.3
@angular-devkit/schematics      19.2.3
@angular/cli                    19.2.3
@angular/ssr                    19.2.3
@schematics/angular             19.2.3
rxjs                            7.8.2
typescript                      5.8.2
zone.js                         0.15.0

Anything else relevant?

See following code:

angular-cli/packages/angular/build/src/utils/server-rendering/prerender.ts

Lines 259 to 262 in c0de723

    
           .catch((err) => { 
        
             errors.push( 
        
               `An error occurred while prerendering route '${route}'.\n\n${err.stack ?? err.message ?? err.code ?? err}`, 
        
             );

in this code if err obj is undefined it won't log exact error, & error is actually undefined in this case.

additional info: API url was starting with undefined instead of https://, due to one code error, it works correctly if api server fails to respond or returns an incorrect response

Are you using withFetch?

yes this is the related code, it also uses tanstack query:

  countriesQuery = injectQuery(() => ({
    queryKey: ['countryList'],
    queryFn: () => {
      return lastValueFrom(this.#profileService.getCountryList());
    },
  }));

fix(@angular/build): correct handling of response/request errors

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build: unhandled exception error during prerender #29884

Command

Is this a regression?

The previous version in which this bug was not present was

Description

Minimal Reproduction

Exception or Error

Your Environment

Anything else relevant?

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

	.catch((err) => {
	errors.push(
	`An error occurred while prerendering route '${route}'.\n\n${err.stack ?? err.message ?? err.code ?? err}`,
	);

build: unhandled exception error during prerender #29884

Description

Command

Is this a regression?

The previous version in which this bug was not present was

Description

Minimal Reproduction

Exception or Error

Your Environment

Anything else relevant?

Activity

imaksp commented on Mar 19, 2025

alan-agius4 commented on Mar 19, 2025

imaksp commented on Mar 19, 2025

angular-automatic-lock-bot commented on Apr 20, 2025

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