Please correct me for this '人多就是非多' I'm a bit confused with '非' here.

Does it mean:

1.'not': which the sentence then would mean the numbers of people wouldn't change anything

2.'mistake': 'a lot of people = A lot of mistakes'

or, from the example I found:

'过节人多，人多就是非多，请问各地警力有保障吗？愿大家都高高兴兴出门，平平安安回家！'


Either 'trash' or 'criminal'?
Note that 是非 should be interpreted as an unbroken word here, it means


  (2) [discord]∶口舌;纠纷


So "人多就是非多" should be interpreted as

人多 (when/if) there're many people
就 then
是非 discord (would be)
多 much