Runtime error after answering “yes” to save with sudo

Description of the problem or steps to reproduce

1. Open a file you don’t have write permission to
2. Try to save the file
3. Answer “y” to the prompt: Permission denied. Do you want to save this file using sudo?
4. The program crashes and prints a message like this:

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x4c pc=0x236db8]

goroutine 20 [running]:
panic(0x5c0880, 0x10b26030)
	/usr/lib/go-1.6/src/runtime/panic.go:481 +0x330
github.com/zyedidia/micro/cmd/micro/vendor/github.com/zyedidia/tcell.(*tScreen).PollEvent(0x0, 0x0, 0x0)
	/build/b68dc646faa0c5dccca78d8c5d88c0fa-xenial/parts/micro/go/src/github.com/zyedidia/micro/cmd/micro/vendor/github.com/zyedidia/tcell/tscreen.go:801 +0x20
main.main.func5()
	/build/b68dc646faa0c5dccca78d8c5d88c0fa-xenial/parts/micro/go/src/github.com/zyedidia/micro/cmd/micro/micro.go:454 +0x3c
created by main.main
	/build/b68dc646faa0c5dccca78d8c5d88c0fa-xenial/parts/micro/go/src/github.com/zyedidia/micro/cmd/micro/micro.go:457 +0x2400

The crash only occurs sometimes. I have not been able to pinpoint the cause.

I’m using micro over SSH.

Specifications

Micro version: 1.4.0 (commit af520cf), installed via snap
OS: Raspbian 9.8 Stretch (Linux 4.14.98-v7+)
Hardware: Raspberry Pi 3B (revision 1.2)

Start in cmd/micro/micro.go around the goroutine at line 454 and inspect the tcell PollEvent call reported in vendor/github.com/zyedidia/tcell/tscreen.go:801. Reproduce the sudo-save flow over SSH, then determine what prevents the nil-pointer panic from recurring and verify the editor remains usable after answering yes.