Companion Error: "Attempt to invoke virtual method 'boolean java.lang.String.equals(...)' on a null object reference" only on PC browser

MIT App Inventor Help
1

I am getting this error while testing my app with Companion:

"Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference"

Strange behavior:

  • When the project is opened on PC browser and connected to Companion → error occurs

  • If I export the same .aia file and import/open it from mobile Chrome browser → Companion works perfectly with no error

  • APK also works fine

Things I already tried:

  • Export/import .aia

  • Different PC browsers

  • Clearing cache

  • Same WiFi network

The issue happens only when editing/opening the project from desktop browser.

2

Does the project include a Firebase component?

What Companion version are you running?

3

yes

latest version nb204b 2.78a

Thanks, you were right. After deleting the Firebase component, the Companion error disappeared completely.

Now the issue is:

  • I still need Firebase in the project

  • Mobile browser + Companion also works

  • Only desktop browser + Companion crashes when Firebase component exists

4

You can use Firebase without the Firebase component ...

5

why its working in mobile browser but not in PC browser?

6

You are not the only one.

7

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