diff --git a/src/component/SeleniumBrowser.js b/src/component/SeleniumBrowser.js
index 3948638..4955dcc 100644
--- a/src/component/SeleniumBrowser.js
+++ b/src/component/SeleniumBrowser.js
@@ -92,16 +92,20 @@ class SeleniumBrowser {
         let uri = params.uri
         logger.info('URL %s', uri)
         if (uri.indexOf('://') > 3) {
-            return this.pool.acquire()
-                .then(async driver => {
-                    let html = await driver.get(uri)
-                        .then(() => driver.findElement(By.css('body')))
-                        .then(body => body.getAttribute('innerHTML'))
-                    let htmlPromise = this.isCaptchaPage(html) ? this.resolveCaptcha(driver) : this.getHtml(driver, html, params)
-                    html = await htmlPromise
-                    this.pool.destroy(driver)
-                    return html
-                })
+            if (this.pool) {
+                return this.pool.acquire()
+                    .then(async driver => {
+                        let html = await driver.get(uri)
+                            .then(() => driver.findElement(By.css('body')))
+                            .then(body => body.getAttribute('innerHTML'))
+                        let htmlPromise = this.isCaptchaPage(html) ? this.resolveCaptcha(driver) : this.getHtml(driver, html, params)
+                        html = await htmlPromise
+                        this.pool.destroy(driver)
+                        return html
+                    })
+            }else {
+                throw new Error('Pool is not ready')
+            }
         } else {
             throw new Error('Invalid URI - ' + uri)
         }