PSReadline throws exception when typing commands

[jrjespersen]

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues, especially the pinned issues.

Exception report

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### Environment
PSReadLine: 2.3.6+d2e770f93b7a53d8660a6402eb29d1ae1c35e767
PowerShell: 7.5.1
OS: Amazon Linux 2023.7.20250428
BufferWidth: 0
BufferHeight: 0

Last 1 Keys:

 g

### Exception

System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.Text.StringBuilder.get_Chars(Int32 index)
   at Microsoft.PowerShell.PSConsoleReadLine.ConvertOffsetToPoint(Int32 offset)
   at Microsoft.PowerShell.PSConsoleReadLine.ReallyRender(RenderData renderData, String defaultColor)
   at Microsoft.PowerShell.PSConsoleReadLine.ForceRender()
   at Microsoft.PowerShell.PSConsoleReadLine.Render()
   at Microsoft.PowerShell.PSConsoleReadLine.Insert(Char c)
   at Microsoft.PowerShell.PSConsoleReadLine.SelfInsert(Nullable`1 key, Object arg)
   at Microsoft.PowerShell.PSConsoleReadLine.ProcessOneKey(PSKeyInfo key, Dictionary`2 dispatchTable, Boolean ignoreIfNoAction, Object arg)
   at Microsoft.PowerShell.PSConsoleReadLine.InputLoop()
   at Microsoft.PowerShell.PSConsoleReadLine.ReadLine(Runspace runspace, EngineIntrinsics engineIntrinsics, CancellationToken cancellationToken, Nullable`1 lastRunStatus)

Screenshot

Environment data

####NOTE: in order to run the commands, I had to first run Remove-Module PSReadLine
PS Version: 7.5.1
PS HostName: ConsoleHost
PSReadLine Version:
PSReadLine EditMode: Emacs
OS: Linux ip-10-120-151-206.intranet.local 6.1.132-147.221.amzn2023.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Apr  8 13:14:54 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
BufferWidth: 0
BufferHeight: 0

Steps to reproduce

This is an Amazon Linux 2023 image running in AWS and using Session Manager (through AWS Systems Manager agent) to establish a console session in a browser tab.

• Connect to instance via Session Manager
• run pwsh
• type any character

Expected behavior

command suggestions based on history (or no error if no suggestions available)

Actual behavior

Exception. Additionally, the exception happens every other command (Command 1 attempt fails, command 2 successful, Command 3 attempt fails, etc). Copy/paste of commands makes no difference. Also, no command history is available.

[jrjespersen]

Update: I tried to repro this on similarly configured systems and did not encounter the issue again. Additionally, I restarted the system having the issue, and it no longer occurs. Therefore I am closing the issue.