Segmentation fault about modsecurity-apache HOT 9 CLOSED

$ export CFLAGS="-g -O0"

(gdb) run
Starting program: /usr/sbin/apache2 -X -d /etc/apache2
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
warning: Temporarily disabling breakpoints for unloaded shared library "/opt/ModSecurity-apache/src/.libs/mod_security3.so"

Breakpoint 1, 0x00005555555c5ee0 in ap_process_request ()
(gdb) n
Single stepping until exit from function ap_process_request,
which has no line number information.

Breakpoint 2, create_tx_context (r=0x7fffe8c2a0a0) at src/mod_security3.c:135
135	    msc_t *msr = NULL;
(gdb) n
136	    msc_conf_t *z = NULL;
(gdb) n
137	    char *unique_id = NULL;
(gdb) n
139	    z = (msc_conf_t *)ap_get_module_config(r->per_dir_config,
(gdb) n
142	    msr = (msc_t *)apr_pcalloc(r->pool, sizeof(msc_t));
(gdb) n
143	    if (msr == NULL) {
(gdb) n
147	    msr->r = r;
(gdb) n
148	    unique_id = getenv("UNIQUE_ID");
(gdb) n
149	    if (unique_id != NULL || strlen(unique_id) > 0) {
(gdb) n

Program received signal SIGSEGV, Segmentation fault.
0x00007fffe8c45222 in create_tx_context (r=0x7fffe8c2a0a0) at src/mod_security3.c:149
149	    if (unique_id != NULL || strlen(unique_id) > 0) {
(gdb) where
#0  0x00007fffe8c45222 in create_tx_context (r=0x7fffe8c2a0a0) at src/mod_security3.c:149
#1  0x00007fffe8c456b1 in hook_request_late (r=0x7fffe8c2a0a0) at src/mod_security3.c:371
#2  0x00005555555a3f00 in ap_run_fixups ()
#3  0x00005555555a661d in ap_process_request_internal ()
#4  0x00005555555c5d08 in ap_process_async_request ()
#5  0x00005555555c5ef0 in ap_process_request ()
#6  0x00005555555c213d in ?? ()
#7  0x00005555555b79f0 in ap_run_process_connection ()
#8  0x00007ffff4819831 in ?? () from /usr/lib/apache2/modules/mod_mpm_prefork.so
#9  0x00007ffff4819ae3 in ?? () from /usr/lib/apache2/modules/mod_mpm_prefork.so
#10 0x00007ffff481acad in ?? () from /usr/lib/apache2/modules/mod_mpm_prefork.so
#11 0x000055555559119e in ap_run_mpm ()
#12 0x0000555555589a7b in main ()
(gdb)