Errors in syslog

I just noticed errors in my syslog that are appearing every second
or so:

Apr 30 17:54:24 localhost kernel: [ 4005.845334] helper[12990]:
segfault at e0 ip 00007f67e817e9d0 sp 00007fffbff09908 error 4 in
libX11.so.6.3.0[7f67e8153000+135000]

I don't know when this started. My earliest syslog file is from
April 22 and the errors already appear there. How can I figure out
what is causing the segfault? I am running Ubuntu 16.04

Thanks

--
David Suna
david-lbDOmM3XA9gS/[email protected]

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