Describe the bug

Hi, we use got in many microservice and yesterday we upgrade v11.5.2 to v11.7.0.

Since this upgrade we have some error

RequestError: Cannot read property 'includes' of undefined
    at /src/node_modules/got/dist/source/core/index.js:1246:38
    at Request._beforeError (/src/node_modules/got/dist/source/core/index.js:1273:11)
    at ClientRequest.<anonymous> (/src/node_modules/got/dist/source/core/index.js:959:18)
    at Object.onceWrapper (events.js:422:26)
    at ClientRequest.emit (events.js:327:22)
    at ClientRequest.origin.emit (/src/node_modules/@szmarczak/http-timer/dist/source/index.js:39:20)
    at Socket.socketErrorListener (_http_client.js:426:9)
    at Socket.emit (events.js:315:20)
    at emitErrorNT (internal/streams/destroy.js:92:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:60:3)
    at Object.calculateRetryDelay [as default] (/src/node_modules/got/dist/source/core/calculate-retry-delay.js:9:44)
    at /src/node_modules/got/dist/source/core/index.js:1236:71
    at Request._beforeError (/src/node_modules/got/dist/source/core/index.js:1273:11)
    at ClientRequest.<anonymous> (/src/node_modules/got/dist/source/core/index.js:959:18)
    at Object.onceWrapper (events.js:422:26)
    at ClientRequest.emit (events.js:327:22)
    at ClientRequest.origin.emit (/src/node_modules/@szmarczak/http-timer/dist/source/index.js:39:20)
    at Socket.socketErrorListener (_http_client.js:426:9)
    at Socket.emit (events.js:315:20)
    at emitErrorNT (internal/streams/destroy.js:92:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:60:3

Do you have any ideas why ? This related to a breaking change ?

• Node.js version: 12
• OS & version: Linux

Actual behavior

Throw a strange error independant of our code.

Expected behavior

Should work like v11.5.2

Checklist

• I have read the documentation.
• I have tried my code with the latest version of Node.js and Got.