In firmware version 1.0.2 the variable MINMAX_HARDWARE_ENDSTOP_Z2 gets defined twice
in Bug Reports
As far as I can tell, this bug has no ill affects, just puts in a redundant variable definition that's not needed. I don't know all the circumstances this happens, but for me with mirrored Z axes and Z endstops, it shows up twice in the same "Endstop Configuration" area in the Configuration.h file.
#define MINMAX_HARDWARE_ENDSTOP_Z2 true // duplicate
#define MINMAX_HARDWARE_ENDSTOP_Z2 true // duplicate
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