@ -3744,7 +3744,7 @@ static void zslInsert(zskiplist *zsl, double score, robj *obj) {
x = zsl->header;
for (i = zsl->level-1; i >= 0; i--) {
while (x->forward[i]->score < score)
while (x->forward[i] && x->forward[i]->score < score)
x = x->forward[i];
update[i] = x;
}
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