Update index.js

index.js

@@ -92,7 +92,7 @@ async function processScreenshot(req, res, { ua, url, type, width, height, langu
 		if (!browserContext) {
 			browserContext = await browser.newContext({
 				userAgent: ua || 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36',
-				viewport: { width: width || 1280, height: height || 800 },
+				viewport: { width: Number(width) || 1280, height: Number(height) || 800 },
 				deviceScaleFactor: 2
 			});
 		}