diff --git a/src/test/java/org/htmlunit/javascript/host/Window2Test.java b/src/test/java/org/htmlunit/javascript/host/Window2Test.java
index 77aad8b56ca..fa468c103b6 100644
--- a/src/test/java/org/htmlunit/javascript/host/Window2Test.java
+++ b/src/test/java/org/htmlunit/javascript/host/Window2Test.java
@@ -181,6 +181,24 @@ public void atob() throws Exception {
         loadPageVerifyTitle2(html);
     }
 
+    /**
+     * @throws Exception if the test fails
+     */
+    @Test
+    @Alerts({"InvalidCharacterError/DOMException"})
+    public void atobMalformedInput() throws Exception {
+        final String html
+            = "<html><head></head><body>\n"
+            + "<script>\n"
+            + LOG_TITLE_FUNCTION
+            + "  try {\n"
+            + "    window.atob('b');\n"
+            + "  } catch(e) {logEx(e)}\n"
+            + "</script>\n"
+            + "</body></html>";
+        loadPageVerifyTitle2(html);
+    }
+
     /**
      * @throws Exception if the test fails
      */
