Panic while unwrap a None value

[0x64617061]

I did fuzz runs on the parse target and the fuzzer detected a panic:

thread 'main' panicked at /repro/latest/pdf/pdf/src/object/function.rs:140:96:
called `Option::unwrap()` on a `None` value

I attached an input the fuzzer generated that caused the related panic:

4d605a3c68717cdf2bbbe69060664453f2b5bc0ec5e92edd12f41deec171bfc7.zip