Updated builds.

build/three.js

@@ -20156,7 +20156,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 			var type, size;
 
-			if ( index.array instanceof Uint32Array ) {
+			if ( index.array instanceof Uint32Array && extensions.get( 'OES_element_index_uint' ) ) {
 
 				type = _gl.UNSIGNED_INT;
 				size = 4;
@@ -23456,15 +23456,9 @@ THREE.WebGLProgram = ( function () {
 
 	}
 
-	function programArrayToString( previousValue, currentValue, index, array ) {
-
-		if ( currentValue !== '' && currentValue !== undefined && currentValue !== null ) {
-
-			return previousValue + currentValue + '\n';
+	function filterEmptyLine( string ) {
 
-		}
-
-		return previousValue;
+		return string !== '';
 
 	}
 
@@ -23678,9 +23672,9 @@ THREE.WebGLProgram = ( function () {
 
 				'#endif',
 
-				''
+				'\n'
 
-			].reduce( programArrayToString, '' );
+			].filter( filterEmptyLine ).join( '\n' );
 
 			prefix_fragment = [
 
@@ -23736,9 +23730,10 @@ THREE.WebGLProgram = ( function () {
 
 				'uniform mat4 viewMatrix;',
 				'uniform vec3 cameraPosition;',
-				''
 
-			].reduce( programArrayToString, '' );
+				'\n'
+
+			].filter( filterEmptyLine ).join( '\n' );
 
 		}