Index: src/wp-includes/admin-bar.php
===================================================================
--- src/wp-includes/admin-bar.php	(revision 50812)
+++ src/wp-includes/admin-bar.php	(working copy)
@@ -917,6 +917,11 @@
 
 	$awaiting_mod  = wp_count_comments();
 	$awaiting_mod  = $awaiting_mod->moderated;
+
+	if ( 0 === $awaiting_mod ) {
+		return;
+	}
+
 	$awaiting_text = sprintf(
 		/* translators: %s: Number of comments. */
 		_n( '%s Comment in moderation', '%s Comments in moderation', $awaiting_mod ),