Whenever i login through my google account i get this error ? "reference.child failed first argument was an invalid path"

Ionic Framework ionic-v3
#1 
gmailLogin(){
   
     
  this.googlePlus.login({
    'scopes': '', // optional, space-separated list of scopes, If not included or empty, defaults to `profile` and `email`.
    'webClientId': '--mykey--', // optional clientId of your Web application from Credentials settings of your project - On Android, this MUST be included to get an idToken. On iOS, it is not required.
    'offline': true
  })
  .then( res => {
   firebase.auth().signInWithCredential(firebase.auth.GoogleAuthProvider.credential(res.idToken))
   .then( success =>{
    this.userProfile = success;
    this.values.isLoggedIn = true;
    console.log("Firebase Success" + JSON.stringify(success));
    firebase.database().ref('/users').child(this.userProfile.uid).set({
      displayName: this.userProfile.displayName,
      photoURL: this.userProfile.photoURL,
      email: this.userProfile.email,
      lastName: "",
      address: "",
      phone: "",
      //facebook: false,
      //secondLogin:false
  });
   this.service.getUserProfile(this.userProfile.uid).on('value', (snapshot) =>{
     this.userProfiles = snapshot.val();
    });

   this.values.userRole = firebase.database().ref('/users').child(this.userProfile.uid).on('value', snapshot =>{
      if(snapshot.val()){
        this.values.userRole = snapshot.val().role;
      } 
    });
     this.nav.navigateRoot(['/tabs/home']);
     
      
    }).catch( error =>{
      this.userProfile = error;
      this.functions.showAlert('Error', error.message);
     console.log("Firebase Failure" + JSON.stringify(error))
     });
  
    
  });
}

So this is my code whenever i login through my google account the user with the uid is generated on my /user in my database but it wont update the data i get from my google account instead gives me error (below) , i do get logged in and the session is with same user only and when i console log the success object i am fetching all the details but it wont set or update the data in my database. i check the Ref URL as well it is all fine :- What iam i doing wrong ?

Screenshot_20191114-133322
Screenshot_20191114-1333221440×3120 201 KB
!

#2

well i fixed my code, the error was minimal I was calling the wrong object after Google login hence the firebase couldn’t find the UID to update or set the data the fixed code is as below

gmailLogin(){
   
     
  this.googlePlus.login({
    'scopes': '', // optional, space-separated list of scopes, If not included or empty, defaults to `profile` and `email`.
    'webClientId': '--mykey--', // optional clientId of your Web application from Credentials settings of your project - On Android, this MUST be included to get an idToken. On iOS, it is not required.
    'offline': true
  })
  .then( res => {
   firebase.auth().signInWithCredential(firebase.auth.GoogleAuthProvider.credential(res.idToken))
   .then( user =>{     //need to call user object 
    
    this.values.isLoggedIn = true;
    console.log("Firebase Success" + JSON.stringify(user));
    firebase.database().ref('/users').child(user.user.uid).set({
      displayName: user.user.displayName, //updated object call 
      photoURL: user.user.photoURL,
      email: user.user.email,
      lastName: "",
      address: "",
      phone: "",
      //facebook: false,
      //secondLogin:false
  });
   
   
     this.nav.navigateRoot(['/tabs/home']);
     
      
    }).catch( error =>{
      this.userProfile = error;
      this.functions.showAlert('Error', error.message);
     console.log("Firebase Failure" + JSON.stringify(error))
     });
 }) ;
}

hope this helps someone