==19249==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0000006d32e7 bp 0xbebebebebebebebe sp 0x7ffc53910bd0 T0)
    #0 0x6d32e6 in instance_destroy /home/ebg/src/map/instance.c:594
    #1 0x6d26bf in do_final_instance /home/ebg/src/map/instance.c:719
    #2 0x797124 in do_final /home/ebg/src/map/map.c:5429
    #3 0x407511 in main /home/ebg/src/common/core.c:450
    #4 0x7f710ff41b44 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b44)
    #5 0x407cf4  (/home/ebg/map-server+0x407cf4)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /home/ebg/src/map/instance.c:594 instance_destroy