Seed crash ('std::ios_base::failure[abi:cxx11])

[Sjors]

./dnsseed -p 5353 -h seed.testnet.bitcoin.sprovoost.nl -n ec2-18-195-105-234.eu-central-1.compute.amazonaws.com -m [email protected] --testnet
Supporting whitelisted filters: 0x1,0x5,0x9,0xd
Using testnet.
Loading dnsseed.dat...done
Starting 4 DNS threads for seed.testnet.bitcoin.sprovoost.nl on ec2-18-195-105-234.eu-central-1.compute.amazonaws.com (port 5353).......done
Starting seeder...done
Starting 96 crawler threads...done
[18-01-21 21:19:44] 759/6834 available (6388 tried in 999s, 1 new, 445 active), 35701 banned; 26 DNS requests, 7 db queriesterminate called after throwing an instance of 'std::ios_base::failure[abi:cxx11]'
  what():  CAutoFile::write : write failed: iostream error
Aborted (core dumped)

dnsstats.log