Comment 2 for bug 673369

It is "UNKNOWN"
Granted, it would be pretty unusual for someone to enter that, but still, webtrees shouldn't crash. I could see someone using it for one the spec doesn't provide for.

The following event, added with nothing else to a just-created INDI, causes the problem:
1 BURI
2 DATE @#DUNKNOWN@ 9 AUG 2019
2 NOTE SVN 9782 chokes on this one
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For what it's worth, the rest of these are verifed SAFE:
1 RESI
2 DATE BET 9 AUG 2019 AND 01 APR 2038
2 NOTE testing
1 TITL
2 DATE FROM 9 AUG 2019 TO 9 AUG 2119
2 NOTE testing
1 NATI
2 DATE BET @#DGREGORIAN@ 9 AUG 2019 AND 01 APR 2038
2 NOTE testing
1 EDUC
2 DATE FROM @#DGREGORIAN@ 9 AUG 2019 TO 9 AUG 2119
2 NOTE testing
1 ADOP
2 DATE @#DJULIAN@ 9 AUG 100 B.C.
2 NOTE testing
1 RETI
2 DATE BEF @#DHEBREW@ KSL 2019
2 NOTE testing
1 DEAT
2 DATE @#DFRENCH R@ 9 BRUM 7
2 NOTE testing
1 PROB
2 DATE INT @#DROMAN@ 9 AUG 2019