ABORT THROWN BY INTERNAL EXCEPTION: Calling GetValue on a value that is NULL

[fuzzerofducks]

Issue found by DuckFuzz on git commit hash using seed 728134730.

To Reproduce

create table all_types as select * exclude(small_enum, medium_enum, large_enum) from test_all_types();
SELECT NULL FROM sniff_csv(NULL, maximum_line_size := NULL)

Error Message

ABORT THROWN BY INTERNAL EXCEPTION: Calling GetValue on a value that is NULL