Predator and CL did not provide any possible suspects.
Using Code Search for the file, "tabs_api.cc" assigning to the concern owner.

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/f125703b5fedcaa29123407147abdb568e0542f5

@catmullings -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

ClusterFuzz has detected this issue as fixed in range 489535:489562.

Detailed report: https://clusterfuzz.com/testcase?key=6412867858595840

Fuzzer: ipc_fuzzer_mut
Job Type: linux_asan_chrome_ipc
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000188
Crash State:
  extensions::ExecuteCodeInTabFunction::Init
  extensions::ExecuteCodeInTabFunction::HasPermission
  extensions::ExtensionFunctionDispatcher::CheckPermissions
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_asan_chrome_ipc&range=488146:488166
Fixed: https://clusterfuzz.com/revisions?job=linux_asan_chrome_ipc&range=489535:489562

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6412867858595840


See https://github.com/google/clusterfuzz-tools for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 6412867858595840 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.