MapServer Crash - Skill LG_SHIELDSPELL

The skill causes Crash on map server, the problem does not occur on every use of skill.[code=auto:0] #0 0x00000000005e23b3 in skill_castend_nodamage_id (src=0x476ecd0, bl=0x476ecd0, skill_id=2315, skill_lv=3, tick=7203432023, flag=0) at skill.c:8609 opt = 0 val = 0 splashrange = 0 shield_data = 0x13b sd = <value optimized out> dstsd = <value optimized out> md = <value optimized out> dstmd = 0x0 hd = <value optimized out> mer = 0x0 sstatus = 0x476f0b8 tstatus = 0x476f0b8 tsc = 0x476f118 tsce = 0x0 element = <value optimized out> type = SC_NONE #1 0x00000000005d3716 in skill_castend_id (tid=10319264, tick=7203432023, id=<value optimized out>, data=0) at skill.c:4920 target = <value optimized out> src = 0x476ecd0 sd = <value optimized out> md = 0x0 ud = 0x476ecf0 sc = <value optimized out> inf = <value optimized out> inf2 = <value optimized out> flag = 0 action = <value optimized out> message = "\301\000\000\000\000\000\000\000\214\026\\\360\377\177\000\000\301\000\000\000\000\000\000\000\267\372e\000\000\000\000\000\274\000\000\000\000\000\000\000\255DP\000\000\000\000\000\270\257\264\002\000\000\000\000(u\235\000\000\000\000\000l\032\\\360\377\177\000\000VQb\000\324\000\000\000W\246[\255\001\000\000\000o\247[\255\001\000\000\000\240\273a\000\000\000\000\000Tcc\000\000\000\000\000\214\026\\\360\377\177\000\000\254\026\\\360\377\177\000\000\370\351\231\000\000\000\000\000\020\037\000\000\000\000\000\000\070u\235\000\000\000\000\000\311\300a\000\000\000\000\000\214\026\\\360\377\177\000\000\000\270\361\001\000\000\000\000(t\235\000\000\000\000\000\020\037\000\000\000\000\000\000\301\000\000\000\000\000\000\000\214\026\\\360\377\177\000\000W\246[\255\001", '\000' <repeats 19 times>"\323, \000\000\000\323\000\000\000\020\\Q\000\000\000\000\000\300\000\000\000\377\377\001" #2 0x0000000000635fc2 in do_timer (tick=7203432035) at timer.c:393 tid = 4608 diff = -12 __FUNCTION__ = "do_timer" #3 0x000000000062d768 in main (argc=<value optimized out>, argv=<value optimized out>) at core.c:249 next = <value optimized out> [/code]