Flaky Segfault in SCIPsolveConcurrent() about scip HOT 9 CLOSED

(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff7abe537 in __GI_abort () at abort.c:79
#2  0x00007ffff7abe40f in __assert_fail_base (fmt=0x7ffff7c27128 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x555556147030 "idx >= 0 && idx < nconcsolvers", file=0x555556146ce0 "/usr/local/google/home/corentinl/dev/scip-multithread/build/_deps/scip-src/src/scip/concurrent.c", line=518, function=<optimized out>) at assert.c:92
#3  0x00007ffff7acd662 in __GI___assert_fail (assertion=0x555556147030 "idx >= 0 && idx < nconcsolvers", file=0x555556146ce0 "/usr/local/google/home/corentinl/dev/scip-multithread/build/_deps/scip-src/src/scip/concurrent.c", line=518, function=0x555556147340 <__PRETTY_FUNCTION__.1> "SCIPconcurrentSolve") at assert.c:101
#4  0x0000555555f62d19 in SCIPconcurrentSolve (scip=0x5555561f6eb0) at /usr/local/google/home/corentinl/dev/scip-multithread/build/_deps/scip-src/src/scip/concurrent.c:518
#5  0x00005555558fbf28 in SCIPsolveConcurrent (scip=0x5555561f6eb0) at /usr/local/google/home/corentinl/dev/scip-multithread/build/_deps/scip-src/src/scip/scip_solve.c:3043
#6  0x0000555555558eed in main () at /usr/local/google/home/corentinl/dev/scip-multithread/Foo/src/main.cpp:120

(gdb) f 4
#4  0x0000555555f62d19 in SCIPconcurrentSolve (scip=0x5555561f6eb0) at /usr/local/google/home/corentinl/dev/scip-multithread/build/_deps/scip-src/src/scip/concurrent.c:518
518	   assert(idx >= 0 && idx < nconcsolvers);

(gdb) info frame
Stack level 4, frame at 0x7fffffffded0:
 rip = 0x555555f62d19 in SCIPconcurrentSolve (/usr/local/google/home/corentinl/dev/scip-multithread/build/_deps/scip-src/src/scip/concurrent.c:518); saved rip = 0x5555558fbf28
 called by frame at 0x7fffffffdfd0, caller of frame at 0x7fffffffde60
 source language c.
 Arglist at 0x7fffffffdec0, args: scip=0x5555561f6eb0
 Locals at 0x7fffffffdec0, Previous frame's sp is 0x7fffffffded0
 Saved registers:
  rbp at 0x7fffffffdec0, rip at 0x7fffffffdec8

gdb) info locals
syncstore = 0x55555621ad40
idx = -1
jobid = 1
i = 16
retcode = SCIP_OKAY
concsolvers = 0x555558327350
nconcsolvers = 16
__PRETTY_FUNCTION__ = "SCIPconcurrentSolve"

(gdb) p (*syncstore)
$10 = {nuses = 17, mode = SCIP_PARA_DETERMINISTIC, initialized = 1, ninitvars = 3, syncdata = 0x5555587ab5a8, lastsync = 0x0, mainscip = 0x5555561f6eb0, stopped = 0, lock = {__data = {__lock = 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0, __spins = 0, __elision = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' <repeats 39 times>, __align = 0}, nsyncdata = 16, minsyncdelay = 2.7000000000000002, maxnsyncdelay = 7, syncfreqinit = 10, syncfreqmax = 2.7000000000000002, maxnsols = 3, nsolvers = 16}
(gdb) p (*syncstore->lastsync)
Cannot access memory at address 0x0
(gdb) p (syncstore->lastsync)
$11 = (SCIP_SYNCDATA *) 0x0