diff --git a/.eslintrc.js b/.eslintrc.js
index f899d4ac..fd4f7baf 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -1,28 +1,28 @@
 module.exports = {
-	parser: 'babel-eslint',
-	plugins: ['svelte3'],
-	overrides: [
-		{
-			files: ['**/*.svelte'],
-			processor: 'svelte3/svelte3'
-		}
-	],
-	rules: {
-		'no-console': [
-			'error',
-			{
-				allow: ['warn', 'error']
-			}
-		],
-		camelcase: [
-			'warn',
-			{
-				ignoreDestructuring: true,
-				properties: 'never'
-			}
-		]
-	},
-	settings: {
-		'svelte3/ignore-styles': attrs => attrs.lang === 'less'
-	}
+    parser: 'babel-eslint',
+    plugins: ['svelte3'],
+    overrides: [
+        {
+            files: ['**/*.svelte'],
+            processor: 'svelte3/svelte3'
+        }
+    ],
+    rules: {
+        'no-console': [
+            'error',
+            {
+                allow: ['warn', 'error']
+            }
+        ],
+        camelcase: [
+            'warn',
+            {
+                ignoreDestructuring: true,
+                properties: 'never'
+            }
+        ]
+    },
+    settings: {
+        'svelte3/ignore-styles': attrs => attrs.lang === 'less'
+    }
 };
diff --git a/src/routes/preview/index.js b/src/routes/preview/index.js
index 8bc82ac3..c1603c2c 100644
--- a/src/routes/preview/index.js
+++ b/src/routes/preview/index.js
@@ -41,6 +41,7 @@ module.exports = {
                         svgonly: fakeBoolean,
                         map2svg: fakeBoolean,
                         transparent: fakeBoolean,
+                        scheme: Joi.string().optional(),
                         logo: Joi.string().optional().valid('auto', 'on', 'off').default('auto')
                     })
                 }
@@ -55,8 +56,6 @@ module.exports = {
                     auth.credentials && auth.credentials.data ? auth.credentials.data.id : ''
                 );
 
-                let chart;
-
                 const queryString = Object.entries({
                     published: request.query.published,
                     ott: request.query.ott,