changed = 0;
for(t=0;t<65536;t++) {
if(used[t] && !(used[t]&2)) {
- if(tags[t]->id==ST_DEFINESPRITE) {
+ if(tags[t]==0) {
+ msg("<warning> ID %d is referenced, but never defined.", t);
+ } else if(tags[t]->id==ST_DEFINESPRITE) {
TAG*tag = tags[t];
while(tag->id != ST_END)
{