fwrite(): Write of 1 bytes failed with errno=32

[Fossil01]

I've been getting these intermittently and haven't been able to figure out why yet. Any ideas?

fwrite(): Write of 1 bytes failed with errno=32 Broken pipe {"exception":"[object] (ErrorException(code: 0): fwrite(): Write of 1 bytes failed with errno=32 Broken pipe at /var/www/REMOVED/vendor/league/climate/src/Util/Writer/StdOut.php:14)