My chat app keeps crashing, on android studio when i run it but there no build errors

as the title explains im creating a chat app on android studio using java and firebase however when ever i run the app it crashes it was fine at first but now im on the chat section of the code and when i try running it, it opens but then crashes there are no build errors. but the logcat shows this error:

2022-01-21 18:41:26.284 23468-23468/com.example.ttt E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.ttt, PID: 23468
    java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
        at com.example.ttt.ChatFragment$1.onBindViewHolder(ChatFragment.java:63)
        at com.example.ttt.ChatFragment$1.onBindViewHolder(ChatFragment.java:53)
        at com.firebase.ui.firestore.FirestoreRecyclerAdapter.onBindViewHolder(FirestoreRecyclerAdapter.java:125)
        at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7065)
        at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7107)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6012)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6279)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6118)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6114)
        at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2303)
        at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1627)
        at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1587)
        at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:665)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4134)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3851)
        at androidx.recyclerview.widget.RecyclerView.consumePendingUpdateOperations(RecyclerView.java:1897)
        at androidx.recyclerview.widget.RecyclerView$1.run(RecyclerView.java:414)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1010)
        at android.view.Choreographer.doCallbacks(Choreographer.java:809)
        at android.view.Choreographer.doFrame(Choreographer.java:740)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:995)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:246)
        at android.app.ActivityThread.main(ActivityThread.java:8506)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
2022-01-21 18:41:26.324 23468-23468/com.example.ttt I/Process: Sending signal. PID: 23468 SIG: 9

Here is the java for chatfragment script:

 package com.example.ttt;

 import android.graphics.Color;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 import android.widget.Toast;

 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;

 import com.firebase.ui.firestore.FirestoreRecyclerAdapter;
 import com.firebase.ui.firestore.FirestoreRecyclerOptions;
 import com.google.firebase.auth.FirebaseAuth;
 import com.google.firebase.firestore.FirebaseFirestore;
 import com.google.firebase.firestore.Query;
 import com.squareup.picasso.Picasso;

 public class ChatFragment extends Fragment
 {
     private FirebaseFirestore firebaseFirestore;
     private FirebaseAuth firebaseAuth;
     LinearLayoutManager linearLayoutManager;


ImageView mimageviewofuser;
FirestoreRecyclerAdapter<firebasemodel,NoteViewHolder> chatAdapter;

RecyclerView mrecyclerview;



@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
{
    View v=inflater.inflate(R.layout.chatfrag,container,false);

    firebaseAuth=FirebaseAuth.getInstance();
    firebaseFirestore=FirebaseFirestore.getInstance();
    mrecyclerview=v.findViewById(R.id.recyclerview);

    Query query=firebaseFirestore.collection("Users");
    FirestoreRecyclerOptions<firebasemodel> allusername=new FirestoreRecyclerOptions.Builder<firebasemodel>().setQuery(query,firebasemodel.class).build();

    chatAdapter=new FirestoreRecyclerAdapter<firebasemodel, NoteViewHolder>(allusername)
    {
        @Override
        protected void onBindViewHolder(@NonNull NoteViewHolder noteViewHolder, int i, @NonNull firebasemodel firebaseModel)
        {
            noteViewHolder.particularusername.setText(firebaseModel.getName());
            String uri=firebaseModel.getImage();



            Picasso.get().load(uri).into(mimageviewofuser);
            if (firebasemodel.getStatus().equals("Online"))
            {
                noteViewHolder.statusofuser.setText(firebaseModel.getStatus());
                noteViewHolder.statusofuser.setTextColor(Color.BLUE);
            }
            else
            {
                noteViewHolder.statusofuser.setText(firebaseModel.getStatus());
            }
            noteViewHolder.itemView.setOnClickListener(new View.OnClickListener()
            {
                @Override
                public void onClick(View v)
                {
                    Toast.makeText(getActivity(), "Item is clicked", Toast.LENGTH_SHORT).show();
                }
            });


        }

        @NonNull
        @Override
        public NoteViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType)
        {
            View view=LayoutInflater.from(parent.getContext()).inflate(R.layout.chatviewlayout,parent, false);
            return new NoteViewHolder(view);
        }
    };

    mrecyclerview.setHasFixedSize(true);
    linearLayoutManager=new LinearLayoutManager(getContext());
    linearLayoutManager.setOrientation(RecyclerView.VERTICAL);
    mrecyclerview.setLayoutManager(linearLayoutManager);
    mrecyclerview.setAdapter(chatAdapter);

    return v;



}
public class NoteViewHolder extends RecyclerView.ViewHolder
{
    private TextView particularusername;
    private TextView statusofuser;

    public NoteViewHolder(@NonNull View itemView)
    {
        super(itemView);
        particularusername=itemView.findViewById(R.id.nameofuser);
        statusofuser=itemView.findViewById(R.id.statusofuser);
        mimageviewofuser=itemView.findViewById(R.id.imageviewofuser);




    }
}

@Override
public void onStart()
{
    super.onStart();
    chatAdapter.startListening();
}

@Override
public void onStop()
{
    super.onStop();
    if (chatAdapter!=null)
    {
        chatAdapter.stopListening();
    }
}

}`

package com.example.ttt;

public class firebasemodel{

String name;
String image;
String uid;
static String status;


public firebasemodel(String name, String image, String uid, String status) {
    this.name = name;
    this.image = image;
    this.uid = uid;
    this.status = status;
}

public firebasemodel() {
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getImage() {
    return image;
}

public void setImage(String image) {
    this.image = image;
}

public String getUid() {
    return uid;
}

public void setUid(String uid) {
    this.uid = uid;
}

public static String getStatus()
{
    return status;
}

public void setStatus(String status) {
    this.status = status;
}

}

I think in your statement in the onBindViewHolder() method:

if (firebasemodel.getStatus().equals("Online"))

firebasemodel.getStatus() returns null. After that, you try to call the equals() method on a null reference, as a result, a NullPointerException is thrown.

To avoid this, try replacing your code with the following:

if ("Online".equals(firebasemodel.getStatus()))

I recommend you to read about checked and unchecked exceptions to understand why the compiler doesn't show any errors during compilation of your code :)

Updated: I think the answer could be simpler. In your statement, you use firebasemodel.getStatus(). Did you want to write firebaseModel.getStatus()?