std::runtime_error Abort trap: 6

[obi1666]

Hello

blocksci_parser was running fine until about 80.9% where it stalled for several hours. Had to be interrupted. Went to restart then this:

$ blocksci_parser ./blocksci_parser.config update
274GB of free disk space available.

Locking data directory.
100.0% done fetching block headers
Starting with chain of 0 blocks
Adding 696595 blocks
libc++abi.dylib: terminating with uncaught exception of type std::runtime_error
Abort trap: 6

Using doctor reveals nothing. blocksci_check_integrity fails immediately with

$blocksci_check_integrity ./blocksci_parser.config
libc++abi.dylib: terminating with uncaught exception of type std::runtime_error
Abort trap: 6

I understand that recommended RAM is >=60GB, but with swapfile on ssd etc, I dont see why this would suddenly stop working.
Thanks

Using AMI: no
BlockSci version: 0.7
Blockchain: Btc
Parser: Disk
Total memory: 32 GB
OS: MacOS 10.14.6