diff --git a/core/misc/announce.js b/core/misc/announce.js
index e0fc2e6..3e579de 100644
--- a/core/misc/announce.js
+++ b/core/misc/announce.js
@@ -91,21 +91,23 @@
    * These messages are then joined and append to the aria-live region as one
    * text node.
    *
-   * @param String text
+   * @param {String} text
    *   A string to be read by the UA.
-   * @param String priority
+   * @param {String} priority
    *   A string to indicate the priority of the message. Can be either
    *   'polite' or 'assertive'. Polite is the default.
    *
    * @see http://www.w3.org/WAI/PF/aria-practices/#liveprops
    */
   Drupal.announce = function (text, priority) {
-    // Save the text and priority into a closure variable. Multiple simultaneous
-    // announcements will be concatenated and read in sequence.
-    announcements.push({
-      text: text,
-      priority: priority
-    });
-    debouncedProcessAnnounce(announcements);
+    if (typeof text === 'string') {
+      // Save the text and priority into a closure variable. Multiple simultaneous
+      // announcements will be concatenated and read in sequence.
+      announcements.push({
+        text: text,
+        priority: priority
+      });
+      debouncedProcessAnnounce(announcements);
+    }
   };
 }(Drupal, Drupal.debounce));
diff --git a/core/misc/message.js b/core/misc/message.js
index 11c4acd..44fb4f2 100644
--- a/core/misc/message.js
+++ b/core/misc/message.js
@@ -54,13 +54,15 @@
    *   Default to 'status'
    */
   Drupal.message = function (message, type) {
-    // Save the text and priority into a closure variable. Multiple simultaneous
-    // announcements will be concatenated and read in sequence.
-    messages.push({
-      text: message,
-      type: type || 'status'
-    });
-    debouncedProcessMessages(messages);
+    if (typeof message === 'string') {
+      // Save the text and priority into a closure variable. Multiple simultaneous
+      // announcements will be concatenated and read in sequence.
+      messages.push({
+        text: message,
+        type: type || 'status'
+      });
+      debouncedProcessMessages(messages);
+    }
   };
 
   /**