From https://github.com/PowerShell/vscode-powershell/issues/2544#issuecomment-598486319.
See also https://github.com/PowerShell/vscode-powershell/issues/2544#issuecomment-598488705.
Likely related to https://github.com/PowerShell/vscode-powershell/issues/2508
Migrating @dgancho's issue here
I have the same problem.
Version: 1.43.1 (system setup)
Commit: fe22a9645b44368865c0ba92e2fb881ff1afce94
Date: 2020-03-18T07:01:20.184Z
Electron: 7.1.11
Chrome: 78.0.3904.130
Node.js: 12.8.1
V8: 7.8.279.23-electron.0
OS: Windows_NT x64 10.0.18363
Running the contributed command: 'PowerShell.ShowSessionMenu' failed.