Dupont wire connection sensitivity
Anything that is an insulator will work.  Paper is about as inexpensive as you can get.
I will attempt to describe in words what I might do.
Cut a strip of paper that is somewhat taller than the bare part of the pins.  Zig-zag the paper between the pins.  Take the free ends of the paper strip and wrap around the full row of pins.  Tape in place.