diff --git a/src/loaders/FileLoader.js b/src/loaders/FileLoader.js
index 90a4c8164ff1be..8ef50615e2757f 100644
--- a/src/loaders/FileLoader.js
+++ b/src/loaders/FileLoader.js
@@ -74,7 +74,6 @@ class FileLoader extends Loader {
 	 * @param {function(any)} onLoad - Executed when the loading process has been finished.
 	 * @param {onProgressCallback} [onProgress] - Executed while the loading is in progress.
 	 * @param {onErrorCallback} [onError] - Executed when errors occur.
-	 * @return {any|undefined} The cached resource if available.
 	 */
 	load( url, onLoad, onProgress, onError ) {
 
@@ -98,7 +97,7 @@ class FileLoader extends Loader {
 
 			}, 0 );
 
-			return cached;
+			return;
 
 		}
 
diff --git a/src/loaders/ImageBitmapLoader.js b/src/loaders/ImageBitmapLoader.js
index 369118b53c2ce0..fc51a88bb3721c 100644
--- a/src/loaders/ImageBitmapLoader.js
+++ b/src/loaders/ImageBitmapLoader.js
@@ -107,7 +107,6 @@ class ImageBitmapLoader extends Loader {
 	 * @param {function(ImageBitmap)} onLoad - Executed when the loading process has been finished.
 	 * @param {onProgressCallback} onProgress - Unsupported in this loader.
 	 * @param {onErrorCallback} onError - Executed when errors occur.
-	 * @return {ImageBitmap|undefined} The image bitmap.
 	 */
 	load( url, onLoad, onProgress, onError ) {
 
@@ -145,8 +144,6 @@ class ImageBitmapLoader extends Loader {
 
 						scope.manager.itemEnd( url );
 
-						return imageBitmap;
-
 					}
 
 				} );
@@ -164,7 +161,7 @@ class ImageBitmapLoader extends Loader {
 
 			}, 0 );
 
-			return cached;
+			return;
 
 		}
 
@@ -189,8 +186,6 @@ class ImageBitmapLoader extends Loader {
 
 			scope.manager.itemEnd( url );
 
-			return imageBitmap;
-
 		} ).catch( function ( e ) {
 
 			if ( onError ) onError( e );
diff --git a/src/renderers/shaders/UniformsUtils.js b/src/renderers/shaders/UniformsUtils.js
index fe68b523726603..f63ce8c791b8c3 100644
--- a/src/renderers/shaders/UniformsUtils.js
+++ b/src/renderers/shaders/UniformsUtils.js
@@ -27,10 +27,7 @@ export function cloneUniforms( src ) {
 
 			const property = src[ u ][ p ];
 
-			if ( property && ( property.isColor ||
-				property.isMatrix3 || property.isMatrix4 ||
-				property.isVector2 || property.isVector3 || property.isVector4 ||
-				property.isTexture || property.isQuaternion ) ) {
+			if ( isThreeObject( property ) ) {
 
 				if ( property.isRenderTargetTexture ) {
 
@@ -45,7 +42,23 @@ export function cloneUniforms( src ) {
 
 			} else if ( Array.isArray( property ) ) {
 
-				dst[ u ][ p ] = property.slice();
+				if ( isThreeObject( property[ 0 ] ) ) {
+
+					const clonedProperty = [];
+
+					for ( let i = 0, l = property.length; i < l; i ++ ) {
+
+						clonedProperty[ i ] = property[ i ].clone();
+
+					}
+
+					dst[ u ][ p ] = clonedProperty;
+
+				} else {
+
+					dst[ u ][ p ] = property.slice();
+
+				}
 
 			} else {
 
@@ -89,6 +102,15 @@ export function mergeUniforms( uniforms ) {
 
 }
 
+function isThreeObject( property ) {
+
+	return ( property && ( property.isColor ||
+		property.isMatrix3 || property.isMatrix4 ||
+		property.isVector2 || property.isVector3 || property.isVector4 ||
+		property.isTexture || property.isQuaternion ) );
+
+}
+
 export function cloneUniformsGroups( src ) {
 
 	const dst = [];
diff --git a/test/unit/src/renderers/shaders/UniformsUtils.tests.js b/test/unit/src/renderers/shaders/UniformsUtils.tests.js
index 8a259b18f16ef2..bc8589c61e646d 100644
--- a/test/unit/src/renderers/shaders/UniformsUtils.tests.js
+++ b/test/unit/src/renderers/shaders/UniformsUtils.tests.js
@@ -114,6 +114,29 @@ export default QUnit.module( 'Renderers', () => {
 
 			} );
 
+			QUnit.test( 'cloneUniforms clones arrays of objects', ( assert ) => {
+
+				const uniforms = {
+					vector3Array: { value: [ new Vector3( 1, 2, 3 ), new Vector3( 4, 5, 6 ) ] },
+				};
+
+				const uniformClones = UniformsUtils.clone( uniforms );
+
+				// Cloned array is a different reference and contains different object references
+				assert.ok( uniforms.vector3Array.value !== uniformClones.vector3Array.value );
+				assert.ok( uniforms.vector3Array.value[ 0 ] !== uniformClones.vector3Array.value[ 0 ] );
+				assert.ok( uniforms.vector3Array.value[ 1 ] !== uniformClones.vector3Array.value[ 1 ] );
+
+				// Values are equal after cloning
+				assert.ok( uniforms.vector3Array.value[ 0 ].equals( uniformClones.vector3Array.value[ 0 ] ) );
+				assert.ok( uniforms.vector3Array.value[ 1 ].equals( uniformClones.vector3Array.value[ 1 ] ) );
+
+				// Mutating the original does not affect the clone
+				uniforms.vector3Array.value[ 0 ].x = 123.0;
+				assert.ok( ! uniforms.vector3Array.value[ 0 ].equals( uniformClones.vector3Array.value[ 0 ] ) );
+
+			} );
+
 			QUnit.test( 'cloneUniforms skips render target textures', ( assert ) => {
 
 				const uniforms = {