Error: Already disposed: Project (Disposed)

HI ! I've added a vfs listener to my project and it seems to be working fine, but sometimes I get the error:

Already disposed: Project (Disposed) environmental-lights: Already disposed: Project (Disposed) environmental-lights
java.lang.AssertionError: Already disposed: Project (Disposed) environmental-lights
    at com.intellij.openapi.components.impl.ComponentManagerImpl.getComponent(ComponentManagerImpl.java:195)
...

Now I'm checking for Project.isDisposed before calling to

MyProjectComponent.getInstance(_project).myMethodHere();

But I don't know if that's ok or this is part of a wrong implementation, because I'm not closing the project, so, why the project is disposed inside my listener?

This is what I'm using:

public class MyFileListener extends VirtualFileAdapter {

    protected Project _project;

    public MyFileListener(Project project){
       _project = project;
    }

    @Override
    public void contentsChanged(VirtualFileEvent event) {
        
            // TODO: why the project is disposed sometimes here?
        
            if( ! _project.isDisposed()){
                MyProjectComponent.getInstance(_project).clearConfigXmlCache();
            }
        
    }
}

and I'm adding the listener inside MyProjectComponent initialization:

VirtualFileManager.getInstance().addVirtualFileListener(new MyFileListener(_project));

What I'm doing wrong?

Thanks !!