This issue looks similar to the  Issue 765917 , hence merging into it.
Please undo it, if it is not the case

ClusterFuzz has detected this issue as fixed in range 506376:506392.

Detailed report: https://clusterfuzz.com/testcase?key=6009782992633856

Fuzzer: inferno_layout_test_unmodified
Job Type: linux_asan_content_shell_drt
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000018
Crash State:
  blink::ImageResourceContent::ImageSize
  blink::ImageDocumentParser::Finish
  blink::DocumentLoader::FinishedLoading
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_asan_content_shell_drt&range=499928:499947
Fixed: https://clusterfuzz.com/revisions?job=linux_asan_content_shell_drt&range=506376:506392

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6009782992633856

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.