Runtime error: invalid memory address or nil pointer dereference

The following error occurs when executing several simultaneous requests:

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19 Jun 2023 22:05:39,909 [INFO] (rapid) ReserveFailed: AlreadyReserved
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x30 pc=0x68c30f]

goroutine 131 [running]:
go.amzn.com/lambda/rapidcore.(*Server).Invoke.func2()
/LambdaRuntimeLocal/lambda/rapidcore/server.go:653 +0xef
created by go.amzn.com/lambda/rapidcore.(*Server).Invoke
/LambdaRuntimeLocal/lambda/rapidcore/server.go:636 +0x23d

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Docker image: public.ecr.aws/lambda/python:3.8

Start with the stack trace in rapidcore/server.go around lines 636 and 653, then reproduce the failure with several simultaneous requests using the public.ecr.aws/lambda/python:3.8 Docker image. Trace the ReserveFailed: AlreadyReserved path and verify that concurrent requests no longer cause an invalid memory address or nil pointer dereference panic.

Written by the indexing model from the issue text.