Change this: https://github.com/rathena/rathena/blob/972a14e4ed3c2ae15f5acb60652cf0c3db1d0deb/src/map/skill.cpp#L13386
To this:
if( (skill_get_type(sg->skill_id) == BF_MAGIC && ((battle_config.land_protector_behavior) ? map_getcell(bl->m, bl->x, bl->y, CELL_CHKLANDPROTECTOR) : map_getcell(unit->bl.m, unit->bl.x, unit->bl.y, CELL_CHKLANDPROTECTOR)) && sg->skill_id != SA_LANDPROTECTOR) ||
and this: https://github.com/rathena/rathena/blob/972a14e4ed3c2ae15f5acb60652cf0c3db1d0deb/src/map/skill.cpp#L18489
To this:
if( !(skill_get_inf2(group->skill_id)&(INF2_SONG_DANCE|INF2_TRAP)) && !(skill_get_inf3(group->skill_id)&(INF3_NOLP)) && group->skill_id != NC_NEUTRALBARRIER && (battle_config.land_protector_behavior ? map_getcell(bl->m, bl->x, bl->y, CELL_CHKLANDPROTECTOR) : map_getcell(unit->bl.m, unit->bl.x, unit->bl.y, CELL_CHKLANDPROTECTOR)) )