Crystal Report hanged at the 16374 pdf softcopy generated

To whom it may concern,

Recently, we have encountered a Crystal Report Problem during generating softcopy in PDF format.

When the Crystal Report generated 16374 pdf softcopy, the Crystal Report program is hanged and without error.  It is replicable error and we have tried many times.

Do you have any idea what is the cause of the issue?

Thanks for your help.