diff --git a/wp-admin/includes/class-wp-press-this.php b/wp-admin/includes/class-wp-press-this.php
index 0ed6d5f444..51b5104e32 100644
--- a/wp-admin/includes/class-wp-press-this.php
+++ b/wp-admin/includes/class-wp-press-this.php
@@ -201,11 +201,17 @@ class WP_Press_This {
 				continue;
 			}
 
-			// @todo Find a more performant to check existence, maybe get_term() with a separate parent check.
-			if ( ! $cat_id = term_exists( $cat_name, $taxonomy->name, $parent ) ) {
-				$cat_id = wp_insert_term( $cat_name, $taxonomy->name, array( 'parent' => $parent ) );
+			// @todo Find a more performant way to check existence, maybe get_term() with a separate parent check.
+			if ( term_exists( $cat_name, $taxonomy->name, $parent ) ) {
+				if ( count( $names ) === 1 ) {
+					wp_send_json_error( array( 'errorMessage' => __( 'This category already exists.' ) ) );
+				} else {
+					continue;
+				}
 			}
 
+			$cat_id = wp_insert_term( $cat_name, $taxonomy->name, array( 'parent' => $parent ) );
+
 			if ( is_wp_error( $cat_id ) ) {
 				continue;
 			} elseif ( is_array( $cat_id ) ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index fb6cc8707f..1edb820bf1 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3-alpha-32826';
+$wp_version = '4.3-alpha-32827';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.