fix index out of bounds issue found by fuzz. #71
| Job | Run time |
|---|---|
| 9m 26s | |
| 9m 34s | |
| 9m 38s | |
| 9m 21s | |
| 9m 23s | |
| 9m 22s | |
| 9m 43s | |
| 9m 24s | |
| 9m 38s | |
| 9m 26s | |
| 9m 54s | |
| 9m 42s | |
| 9m 23s | |
| 9m 45s | |
| 9m 19s | |
| 9m 34s | |
| 9m 28s | |
| 9m 45s | |
| 9m 34s | |
| 10m 0s | |
| 9m 50s | |
| 9m 21s | |
| 9m 17s | |
| 9m 36s | |
| 9m 18s | |
| 9m 25s | |
| 9m 43s | |
| 9m 32s | |
| 9m 8s | |
| 9m 27s | |
| 9m 8s | |
| 9m 17s | |
| 9m 19s | |
| 9m 12s | |
| 9m 22s | |
| 8m 54s | |
| 9m 50s | |
| 5h 50m 58s |