PAP object entered

This occurred while running our sizeable program I have no idea what the program was doing when this error was encountered but the compiler asked me to report it here:

programName: internal error: PAP object entered!
    (GHC version 8.4.3 for x86_64_unknown_linux)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
Aborted

I don't have a way to reproduce this yet.

Edited Mar 10, 2019 by recursion-ninja

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PAP object entered