REPL crash when specifying let or var

Version

v24.4.0

Platform

Microsoft Windows NT 10.0.26100.0 x64

Subsystem

REPL

What steps will reproduce the bug?

Launch powershell and type "node" to open the REPL, then type "let" and any letter after that will initiate the crash

2025-07-11_00-37-27.mp4

How often does it reproduce? Is there a required condition?

Every time

What is the expected behavior? Why is that the expected behavior?

The repl doesn't crash and allows variable declaration

What do you see instead?

The repl crashes with the following error

node:internal/readline/emitKeypressEvents:74
            throw err;
            ^

TypeError: Cannot read properties of null (reading 'start')
    at findExpressionCompleteTarget (node:repl:1722:68)
    at REPLServer.complete (node:repl:1487:55)
    at REPLServer.completer (node:repl:792:5)
    at showCompletionPreview (node:internal/repl/utils:233:10)
    at showPreview (node:internal/repl/utils:389:7)
    at REPLServer.self._ttyWrite (node:repl:1037:9)
    at ReadStream.onkeypress (node:internal/readline/interface:284:20)
    at ReadStream.emit (node:events:507:28)
    at ReadStream.emit (node:domain:489:12)
    at emitKeys (node:internal/readline/utils:371:14)

Additional information

It seems like the following code is responsible for the crash, somehow lastDeclarationInit is null. If it helps at all I downloaded node via fnm

	// If the last statement is a variable declaration statement the last declaration is
	// what we can potentially complete on, so let's re-run the function's logic on that
	if (lastBodyStatement.type === 'VariableDeclaration') {
	const lastDeclarationInit = lastBodyStatement.declarations.at(-1).init;
	const lastDeclarationInitCode = code.slice(lastDeclarationInit.start, lastDeclarationInit.end);
	return findExpressionCompleteTarget(lastDeclarationInitCode);
	}