iirc I walked over the melee_entered map labels when the game crashed:

INFO: AddressSanitizer ignores mlock/mlockall/munlock/munlockall
ASAN:SIGSEGV
=================================================================
==10184== ERROR: AddressSanitizer: SEGV on unknown address 0x00000000000a (pc
0x7f9a16a3447e sp 0x7fff938a2cc0 bp 0x603a000af540 T0)
AddressSanitizer can not provide additional info.
    #0 0x7f9a16a3447d (/usr/lib/liblua.so.5.2.1+0x947d)
    #1 0x7f9a16a45d4b (/usr/lib/liblua.so.5.2.1+0x1ad4b)
    #2 0x4481c2 (/home/matthias/vcs/git/freedroid/src/freedroidRPG+0x4481c2)
    #3 0x439a2d (/home/matthias/vcs/git/freedroid/src/freedroidRPG+0x439a2d)
    #4 0x485030 (/home/matthias/vcs/git/freedroid/src/freedroidRPG+0x485030)
    #5 0x4ae61e (/home/matthias/vcs/git/freedroid/src/freedroidRPG+0x4ae61e)
    #6 0x415c59 (/home/matthias/vcs/git/freedroid/src/freedroidRPG+0x415c59)
    #7 0x7f9a15f8ebc4 (/usr/lib/libc-2.18.so+0x21bc4)
    #8 0x41640c (/home/matthias/vcs/git/freedroid/src/freedroidRPG+0x41640c)
==10184== ABORTING

addr2line -e src/freedroidRPG 0x4481c2 0x439a2d 0x485030 0x4ae61e 0x415c59 0x41640c
/home/matthias/vcs/git/freedroid/src/lua.c:1815
/home/matthias/vcs/git/freedroid/src/event.c:275
/home/matthias/vcs/git/freedroid/src/influ.c:452
/home/matthias/vcs/git/freedroid/src/main.c:106
/home/matthias/vcs/git/freedroid/src/main.c:182
??:?


@ 7e2884fccae10589bb205c3f16afa74456566644

I can't reproduce it. Do the crash occurs without AddressSanitizer?

No, it doesn't (at least I didn't notice it so far).
It even WITH the AddressSanitizer, I only got it that one time when I filed report.

Can not be reproduced