I have set a proxy in npm global config. On installing any package I am getting following error. 
Below is my node and npm version:
npm: 6.13.4
node: v12.16.1

As I am behind proxy, what else is required to overcome this issue. Every help will be appreciated.
I have also tried by updating node version, removing and after restart setting proxy again, but none of that worked.

```
    C:\test>npm i level-db-helper
    npm ERR! cb() never called!

    npm ERR! This is an error with npm itself. Please report this error at:
    npm ERR!     <https://npm.community>

    npm ERR! A complete log of this run can be found in:
    npm ERR!     C:\Users\user\AppData\Roaming\npm-cache\_logs\2020-03-03T04_51_02_995Z-debug.log

    C:\test>npm get proxy
    http://my-proxy.com:8080

    C:\test>npm get https-proxy
    http://my-proxy.com:8080

    C:\test>

```

Below is my log file content

```
0 info it worked if it ends with ok
1 verbose cli [
1 verbose cli   'C:\\Program Files\\nodejs\\node.exe',
1 verbose cli   'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli   'i',
1 verbose cli   'level-db-helper'
1 verbose cli ]
2 info using npm@6.13.4
3 info using node@v12.16.1
4 verbose npm-session b2d05546852e6399
5 silly install loadCurrentTree
6 silly install readLocalPackageData
7 timing npm Completed in 3615ms
8 error cb() never called!
9 error This is an error with npm itself. Please report this error at:
10 error <https://npm.community>

```