jsonb crash

Hi,

I found a crash (segmentation fault) on jsonb.
This is the best I could do to reduce the query:

"""
select  
  75 as c1
from 
  public.pagg_tab_ml as ref_0,
  lateral (select  
        ref_0.a as c5 
      from generate_series(1, 300) as sample_0
      fetch first 78 rows only
      ) as subq_0
where case when (subq_0.c5 < 2) 
           then cast(null as jsonb) 
       else cast(null as jsonb) 
      end ? ref_0.c
"""

And because it needs pagg_tab_ml it should be run a regression database.
This affects at least 14 and 15.

Attached is the backtrace.

-- 
Jaime Casanova
Director de Servicios Profesionales
SystemGuards - Consultores de PostgreSQL