I have a chain of middlewares set up based on this repo: https://github.com/HamedBahram/next-middleware-chain/tree/main

Middlewares are working fine. But if I add a middleware that asynchronously gets data from my db (using mongoose), the server throws the following error. No idea why or what I can do about this.

Error [TypeError]: edgeFunction is not a function
    at runWithTaggedErrors (path/to/project/node_modules/next/dist/server/web/sandbox/sandbox.js:96:30)
    at async DevServer.runMiddleware (path/to/project/node_modules/next/dist/server/next-server.js:964:24)
    at async DevServer.runMiddleware (path/to/project/node_modules/next/dist/server/dev/next-dev-server.js:251:28)
    at async DevServer.handleCatchallMiddlewareRequest (path/to/project/node_modules/next/dist/server/next-server.js:1053:22)
    at async DevServer.handleRequestImpl (path/to/project/node_modules/next/dist/server/base-server.js:736:32) {
  middleware: true
}