Server is being too resource hungry

may relate to MC-90062
of the server being to resource hungry.
but this is weird it says

at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap.get(Long2ObjectOpenHashMap.java:379)

i have never seen such an output from a server, maybe its a snapshot thing but it happened after i wrote /locate endcity in the overworld, i meant to type
/locate enddungeon

so i think that the issue
i havent been able to find a duplicate on this yet

EDIT: adding more ram solve the /locate command issue but its still crashing. see Crash log 3.txt