Error: Unexpected token } in JSON at position 1957

After the upgrade to Cordova 6.4.0, I am getting following error while adding platforms (android or ios) or any plugin. This error is coming at end of the output.

"Error: Unexpected token } in JSON at position 1957"

However, plugins, platform getting added successfully.

Here is output (removed my project specific info),
$ ionic platform add ios
Running command:
....
Adding ios project...
..
Creating Cordova project for the iOS platform:
..

iOS project created with cordova-ios@4.3.0
..

Error: Unexpected token } in JSON at position 1957

$ ionic platform add android@5.2.2
Running command:

Adding android project...

Creating Cordova project for the Android platform:

Path: platforms/android

Package: com.test.myapp
Name:
Activity: MainActivity

Android target: android-23

Android project created with cordova-android@5.2.2

Error: Unexpected token } in JSON at position 1957

I am not sure consequences of this error, currently I am not able run the android app as it is not able to load the plug-ins while launching.