What causes the this splunkd Search Head Assertion in Splunk 7.1.1?

[mdwecht]

Hello,

splunkd: /home/build/build-src/nightlight/src/framework/SearchResultsMem.cpp:839: SearchResultsMem::iterator SearchResultsMem::erase(SearchResultsMem::iterator, SearchResultsMem::iterator): Assertion `it != end()' failed.

Trying to track down RAM issues but at the same time would like more specific information on what Splunk is trying to do.

Please advise...

Mark