left shift of negative value -1

Found this while decoding Chimera-AV1-8bit-480x270-552kbps.ivf

Decoded 457/8929 frames (5.1%) ../src/picture.c:160:17: runtime error: left shift of negative value -1 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../src/picture.c:160:17