"fatal error: concurrent map iteration and map write" when using gzip compression

[angarg12]

Command line arguments / config

./ghz \     
--proto ./request.proto \
--call Request \
-d "{\"input\":{\"body\":\"${data}\"}}" \
--skipFirst 30000 \
-x 5m -e \
--duration-stop="wait" \
-c 40 \
--connections 40 \
--rps 2500 \
"someurl"

Describe the bug
When I run ghz with the -e flag, I get the error "fatal error: concurrent map iteration and map write".

The program works perfectly without the flag

Full dump here

https://pastebin.com/VNWDxQdS

To Reproduce
Run a load test with -e

Expected behavior
Program should work.

Environment

• OS: Amazon Linux 2
• ghz: built from source, --version says dev