Unexpected termination and restart of postgresql 9.6 - postgresql

Question

We have a postgresql 9.6.14 postgres server, where we run a query which caused a termination of postgresql process and restart of the postgresql process.
We don't know why it happened.
The query runs fine when we query it with another filter value, so I guess it has to do with the amount of data it is querying. But can this really cause a restart of the whole postgres service? So maybe a memory problem?
postgresql.log
2019-07-12 17:54:13.487 CEST [6459]: [7-1] user=,db=,app=,client= LOG:
server process (PID 11064) was terminated by signal 11: Segmentation
fault 2019-07-12 17:54:13.487 CEST [6459]: [8-1]
user=,db=,app=,client= DETAIL: Failed process was running:
2019-07-12 17:54:13.487 CEST [6459]: [9-1] user=,db=,app=,client= LOG:
terminating any other active server processes 2019-07-12 17:54:13.488
CEST [11501]: [1-1] user=hg,db=test,app=[unknown],client=172.31.0.43
WARNING: terminating connection because of crash of another server
process 2019-07-12 17:54:13.488 CEST [11501]: [2-1]
user=hg,db=test,app=[unknown],client=172.31.0.43 DETAIL: The
postmaster has commanded this server process to roll back the current
transaction and exit, because another server process exited abnormally
and possibly corrupted shared memory. 2019-07-12 17:54:13.488 CEST
[11501]: [3-1] user=hg,db=test,app=[unknown],client=172.31.0.43 HINT:
In a moment you should be able to reconnect to the database and repeat
your command. 2019-07-12 17:54:13.488 CEST [8889]: [2-1]
user=hg,db=_test,app=[unknown],client=172.31.0.46 WARNING:
terminating connection because of crash of another server process
select stat.*,
(
Select
1
From
table1 a, table2 pg
Where
a.field_1::Text = stat.field_1::Text And
a.field_2::Text = stat.field_2::Text And
stat.field_3::Text = pg.field_3::Text And
a.field_4= pg.field_4
limit 1
)
from table3 stat
where field_1= 'xyz';