UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Steps to reproduce the problem:
This appears to be a harmless nullptr access, but note that ASAN doesn't catch this and just crashes.

UBSAN report.

fpdfapi/parser/cpdf_array.cpp:105:24: runtime error: member call on null pointer of type 'CPDF_Object'
    #0 0xf90786 in CPDF_Array::GetDirectObjectAt(unsigned long) fpdfapi/parser/cpdf_array.cpp:105:24
    #1 0xfeb3e8 in CPDF_Array::GetDictAt(unsigned long) fpdfapi/parser/cpdf_array.cpp:139:20
    #2 0x106e4e1 in CPDF_Document::TraversePDFPages(int, int*, unsigned long) fpdfapi/parser/cpdf_document.cpp:282:39
    #3 0x106eb0d in CPDF_Document::TraversePDFPages(int, int*, unsigned long) fpdfapi/parser/cpdf_document.cpp:305:34
    #4 0x105c07a in CPDF_Document::GetPageDictionary(int) fpdfapi/parser/cpdf_document.cpp:367:28

Chromium report.

Received signal 11 SEGV_MAPERR 000000000000
#0 0x7f4f98d6d25c base::debug::StackTrace::StackTrace()
#1 0x7f4f98d6cdc1 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7f4f941ec330 <unknown>
#3 0x7f4f9cc6682e CPDF_Array::GetDictAt()
#4 0x7f4f9cc723d0 CPDF_Document::TraversePDFPages()
#5 0x7f4f9cc726e3 CPDF_Document::GetPageDictionary()

What is the expected behavior?

What went wrong?
^

Did this work before? No 

Chrome version: 66.0.3359.139  Channel: n/a
OS Version: Ubuntu
Flash Version: