Jay, you reported a different crash, but the PTDEBUG has more of these crashes:
Error checking `db`.`table` for duplicate keys: Use of uninitialized value $ck_cols in regexp compilation at /usr/bin/pt-duplicate-key-checker line 2371.
That's fixed. I'll look into the similar error for $ddl.
Jay, you reported a different crash, but the PTDEBUG has more of these crashes:
Error checking `db`.`table` for duplicate keys: Use of uninitialized value $ck_cols in regexp compilation at /usr/bin/ pt-duplicate- key-checker line 2371.
That's fixed. I'll look into the similar error for $ddl.