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-rw-r--r--src/map/skill.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/src/map/skill.c b/src/map/skill.c
index cd9115df4..ffb5a1826 100644
--- a/src/map/skill.c
+++ b/src/map/skill.c
@@ -6754,15 +6754,23 @@ int skill_dance_overlap(struct skill_unit* unit, int flag)
*------------------------------------------*/
static bool skill_dance_switch(struct skill_unit* unit, int flag)
{
+ static int prevflag = 1; // by default the backup is empty
static struct skill_unit_group backup;
struct skill_unit_group* group = unit->group;
- //TODO: add protection against attempts to read an empty backup / write to a full backup
-
// val2&UF_ENSEMBLE is a hack to indicate dissonance
if ( !(group->state.song_dance&0x1 && unit->val2&UF_ENSEMBLE) )
return false;
+ if( flag == prevflag )
+ {// protection against attempts to read an empty backup / write to a full backup
+ ShowError("skill_dance_switch: Attempted to %s (skill_id=%d, skill_lv=%d, src_id=%d).\n",
+ flag ? "read an empty backup" : "write to a full backup",
+ group->skill_id, group->skill_lv, group->src_id);
+ return false;
+ }
+ prevflag = flag;
+
if( !flag )
{ //Transform
int skillid = unit->val2&UF_SONG ? BA_DISSONANCE : DC_UGLYDANCE;