master branch: invalid memory address or nil pointer dereference

[Alan3344]

Describe the bug
Exception logs during high concurrency: invalid memory address or nil pointer dereference`

To Reproduce
Steps to reproduce the behavior:

1. Writing sample code, then go build
2. Writing batch file: @locust -f %* --users 10000 --spawn-rate 100 --master-host=192.168.1.25 --master-bind-port=5557 --master, then exec .\master.cmd tasks\bin.py in pwsh.exe
3. exec golocust.exe -master-host 192.168.1.25 -max-rps 1000 -request-increase-rate 100
4. Locsut WebUI click Start Spwn

Expected behavior
I don't know what the impact will be at the moment, I hope it can be fixed

Screenshots

Environment (please complete the following information):

• OS:

  Version Windows 11 Professional
  Version number 24H2
  Installation date ‎2024-‎11-‎4
  Operating system version 26100.2033
  Experience Windows Feature Experience Pack 1000.26100.23.0
  

• Go Version: go version go1.23.2 windows/amd64

Additional context
Local deployment API, optional:

• httpbin
• httpbun

[myzhan]

Line 134 of worker.go has panic issue.