A few days ago, I ran Setup to update my currently installed package, including my git packages.  Since then, whenever I run git gui, I get the following error:

$ git gui
assertion "font != NULL" failed: file "/usr/src/ports/fontconfig/fontconfig-2.11.1-3.x86_64/src/fontconfig-2.11.1/src/fcmatch.c", line 453, function: FcFontRenderPrepare
error: git-gui died of signal 6

cygcheck and xwin logs attached