How to get the previous image of git of master baranch

Please show me tbe way to get the previous image git go master branch.

For my cygwin build of gnuplot on the development source, gnuplot does not run 
$ src/gnuplot
(nothing happen) 
$ 
(back to prompt)

I exucute gnuplot via gdb and set back trace to main but gnuplot ends.

I want to get the previous git source to see from what change causes the issue.
I note thar I could execute gnuplot 5.4.3 built myself.

Thank for advance.

Tatsuro



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