Make a Global Scope of a mesh using Three.js

Question

I am making my first steps coding with JavaScript and playing with Three.js too.

In my code I made this function:

    var loader = new THREE.BinaryLoader();
    loader.load( "sources/obj/mmlogo/mm_logo.js", function ( geometry ) {

        uniforms = {
            color: {
            type: "c",
            value: new THREE.Color(0x000000),
            },
            envMap: {
            type: "t",
            value: reflectionCube
            },
            fresnelBias: {
            type: "f",
            value: 0.1
            },
            fresnelScale: {
            type: "f",
            value: 1.0
            },
            fresnelPower: {
            type: 'f',
            value: 2.0
            }
        };

        material = new THREE.ShaderMaterial( {

            uniforms : uniforms,
            vertexShader : vertexShader,
            fragmentShader : fragmentShader,
            wireframe: false,
            side: THREE.DoubleSide,

        });

        monogram = new THREE.Mesh( geometry, material );
        monogram.scale.set( 1, 1, 1 );
        monogram.position.z = -9;
        scene.add( monogram );

    });

and then I made this render function:

    function render() {

        frame += 0.1/3;
        monogram.scale.z += Math.sin(frame)/600;

        TWEEN.update();

        targetX = mouseX * .0005;
        targetY = mouseY * .0005;


        if ( monogram ) {

        monogram.rotation.y += 0.05 * ( targetX - monogram.rotation.y );
        monogram.rotation.x += 0.05 * ( targetY - monogram.rotation.x );

        }

        renderer.render( scene, camera );

    }

I can see everything and everything works ok. But my console says that there is an error: Uncaught ReferenceError: monogram is not defined.

I think that I have to make a Global Scope of monogram. So I wrote var before monogram and it doesnt work, then I wrote

monogram = new THREE.Mesh( geometry, material );
            monogram.scale.set( 1, 1, 1 );
            monogram.position.z = -9;
            scene.add( monogram );

outside my function and it doesnt work.

Do you have some suggestion? My app works, even if the console says that there is n error, I think that is better if my console says that everything is ok.