diff --git a/projects/packages/my-jetpack/changelog/fix-my-jetpack-red_bubble_fatals b/projects/packages/my-jetpack/changelog/fix-my-jetpack-red_bubble_fatals
new file mode 100644
index 0000000000000..1d042bc99acb9
--- /dev/null
+++ b/projects/packages/my-jetpack/changelog/fix-my-jetpack-red_bubble_fatals
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fixed
+
+Prevent PHP errors when notification data is malformed.
diff --git a/projects/packages/my-jetpack/src/class-red-bubble-notifications.php b/projects/packages/my-jetpack/src/class-red-bubble-notifications.php
index 93f3d8b516b38..2a330268c9a3d 100644
--- a/projects/packages/my-jetpack/src/class-red-bubble-notifications.php
+++ b/projects/packages/my-jetpack/src/class-red-bubble-notifications.php
@@ -43,6 +43,9 @@ public static function register_rest_endpoints() {
 							'type' => 'string',
 						),
 						'sanitize_callback' => function ( $param ) {
+							if ( ! is_array( $param ) ) {
+								return array();
+							}
 							return array_map( 'sanitize_text_field', $param );
 						},
 					),