fix index out of bounds issue found by fuzz. #68
| Job | Run time |
|---|---|
| 9m 30s | |
| 9m 15s | |
| 9m 19s | |
| 9m 18s | |
| 9m 25s | |
| 9m 24s | |
| 9m 25s | |
| 9m 11s | |
| 9m 16s | |
| 9m 27s | |
| 9m 12s | |
| 9m 33s | |
| 9m 17s | |
| 9m 50s | |
| 9m 12s | |
| 9m 26s | |
| 9m 29s | |
| 9m 25s | |
| 9m 41s | |
| 10m 3s | |
| 9m 17s | |
| 9m 18s | |
| 9m 36s | |
| 9m 36s | |
| 9m 20s | |
| 9m 10s | |
| 9m 8s | |
| 9m 17s | |
| 8m 53s | |
| 9m 29s | |
| 9m 30s | |
| 9m 13s | |
| 9m 30s | |
| 9m 16s | |
| 9m 21s | |
| 9m 24s | |
| 9m 39s | |
| 5h 47m 35s |