Google-font enqueue crashes when filtered font list is boolean

[pirate-bot]

Summary

Google-font registration can terminate a frontend request with TypeError: array_keys(): Argument #1 ($array) must be of type array, bool given.

Expected behavior: Font registration handles an invalid Google Fonts list without crashing the page request.

Actual behavior: A boolean Google Fonts list reaches font registration and causes an uncaught TypeError.

Impact: Affected frontend requests, including the reported 404 template path, fail before the page is rendered.

Customer context

• Product / area: Neve Google Fonts frontend registration
• Version: 3.8.16
• Environment: WordPress 7.1; PHP 7.4.33 and 8.0.30 in observed reports
• Integration / third party: A filterable Google Fonts data path; the component returning false was not identified
• Reported error / symptom: TypeError: array_keys(): Argument #1 ($array) must be of type array, bool given
• Impact: 3 occurrences across 2 production sites between 2026-08-20 and 2026-08-26; request context was frontend.

Reproduction notes

1. Select or otherwise register at least one Google font so Font_Manager::register_google_fonts() has a font family to process.
2. In the Google Fonts variant-list filter path, return false from neve_google_fonts_with_variants_array.
3. Load a frontend page.

Observed production result: the request terminates at array_keys() in Font_Manager::enqueue_google_font().

Reproduction status: source-confirmed against v3.8.16; no local WordPress runtime reproduction was performed.

Diagnosis

Conclusion

Production telemetry places the uncaught TypeError at array_keys() in Neve's Google-font enqueue path. The v3.8.16 source confirms that Font_Manager::enqueue_google_font() passes the result from neve_get_google_fonts( true ) to array_keys() without validating that the filtered result remains an array. neve_get_google_fonts() applies neve_google_fonts_with_variants_array directly, so a boolean value can reach this call.

Where this likely occurs

• Frontend hook registration: inc/views/font_manager.php — lines 90-96, Font_Manager::init() attaches Font_Manager::register_google_fonts() to wp_enqueue_scripts.
• Failing workflow: inc/views/font_manager.php — lines 149-152, Font_Manager::register_google_fonts() invokes Font_Manager::enqueue_google_font() for collected font families.
• Fatal call in the affected release: inc/views/font_manager.php — lines 186-194 in Font_Manager::enqueue_google_font() obtains the variant list then calls array_keys( $google_fonts ); this is line 192 in tag v3.8.16, matching telemetry.
• Filterable input boundary: globals/utilities.php — lines 438-445, neve_get_google_fonts() returns apply_filters( 'neve_google_fonts_with_variants_array', $fonts ) for the variant-list branch without a type check.
• History: blame attributes the array_keys( $google_fonts ) call to 9917ac75d (2021-09-22). The identical code is present in v3.8.15, so the inspected adjacent releases do not support a 3.8.16 regression boundary.

Engineering notes

• The stock font data is loaded with neve_require_array() before the filter is applied. The observed boolean therefore indicates that the filter result, rather than the initial file-load value, is the relevant unvalidated boundary.
• The telemetry stack reaches header.php through a 404 template and the WordPress frontend enqueue hook. The same callback is also registered for editor assets, but no editor crash was reported or reproduced.
• No Themeisle SDK frame is involved; telemetry identifies this as product code, and the inspected code is in the Neve repository.

Test coverage status

• e2e-tests/specs/customizer/typography/font-family.spec.ts verifies selected Google font rendering on frontend and editor paths, but does not exercise an invalid variant-list filter result.
• tests/test-neve-file-guards.php lines 152-160 verifies only that the normal neve_get_google_fonts() result is an array. Lines 163-240 test customizer handling of array font lists; they do not cover Font_Manager::enqueue_google_font() with neve_google_fonts_with_variants_array returning false.

What to verify or explore next

• Reproduce with a selected Google font and a temporary callback on neve_google_fonts_with_variants_array that returns false, then load a frontend template.
• Check the equivalent editor-assets request because Font_Manager::init() registers the same font callback there.
• Inspect active plugins or custom code on an affected site only through available diagnostic evidence to identify what returns a boolean from the filter.

Unknowns / follow-up

• The telemetry report does not identify the callback or configuration that returns false from the filter.
• The inspected repository does not include a runtime reproduction environment, so the exact font setting and third-party interaction remain unverified.

Confidence

Confidence: 96/100

Production telemetry captures the fatal on two sites, and the released v3.8.16 source passes the unvalidated result of a filterable font-list helper directly to array_keys(). The same call exists in v3.8.15, so the available history does not establish a regression.

Crash telemetry

Occurrences	3
Distinct sites	2
First seen	2026-08-20 05:57 UTC
Last seen	2026-08-26 22:10 UTC
Crash location	product:inc/views/font_manager.php:192
Request context	frontend
Inside Themeisle SDK	no
Product versions	3.8.16
WP versions	7.1
PHP versions	7.4.33, 8.0.30
SDK versions	3.3.58

---

Source: automated crash report — neve, fingerprint 629b4ca1cba53b9e2d8da49a0afcf8e7
Generated by bug-report-triage (ID: bug-report-triage_6a8fd2c3597416.59561095)