Negative Interaction Length Warning from Running Machine with Biasing.

This warning pops up a lot when simulating a machine that uses biasing. The warning is of the form:

#!

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : BIAS.GEN.13
      issued by : G4InteractionLawPhysical::UpdateInteractionLengthForStep(...)
 Negative number of interaction length for `LawForOperationXSchange-protonInelastic' -0.00131761, set it to zero !

*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

I have attached a gmad file which can recreate this issue.

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