vacuum info - crash

Hello, I'm a newbie

I have recieve information from vacuum verbose analyze
I don't know meaning of "Crash 5402"

Anyone can explain aboyut that ?

Regards
EKo PRanoto

---------VACUUM Message----------------------
NOTICE:  --Relation nolab_null--
NOTICE:  Pages 5357: Changed 0, reaped 5357, Empty 0, New
0; Tup 0: Vac 1092766, Keep/VTL 0/0,
Crash 5402, UnUsed 0, MinLen 0, MaxLen 0; Re-using:
Free/Avail. Space 39406340/0;
EndEmpty/Avail. Pages 5357/0. CPU 0.31s/0.12u sec.
NOTICE:  Index nolab_null_mintalab_dt_id_heade: Pages
5867; Tuples 0: Deleted 1092765.
CPU 1.50s/8.62u sec.
NOTICE:  Rel nolab_null: Pages: 5357 --> 0.
NOTICE:  Analyzing...
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