diff --git a/src/wp-admin/includes/class-wp-comments-list-table.php b/src/wp-admin/includes/class-wp-comments-list-table.php
index 6a3080ff9c..c489efee7b 100644
--- a/src/wp-admin/includes/class-wp-comments-list-table.php
+++ b/src/wp-admin/includes/class-wp-comments-list-table.php
@@ -462,8 +462,8 @@ class WP_Comments_List_Table extends WP_List_Table {
 
 			if ( 'spam' != $the_comment_status && 'trash' != $the_comment_status ) {
 				$actions['edit'] = "<a href='comment.php?action=editcomment&amp;c={$comment->comment_ID}' title='" . esc_attr__( 'Edit comment' ) . "'>". __( 'Edit' ) . '</a>';
-				$actions['quickedit'] = '<a onclick="commentReply.open( \''.$comment->comment_ID.'\',\''.$post->ID.'\',\'edit\' );return false;" class="vim-q" title="'.esc_attr__( 'Quick Edit' ).'" href="#">' . __( 'Quick&nbsp;Edit' ) . '</a>';
-				$actions['reply'] = '<a onclick="commentReply.open( \''.$comment->comment_ID.'\',\''.$post->ID.'\' );return false;" class="vim-r" title="'.esc_attr__( 'Reply to this comment' ).'" href="#">' . __( 'Reply' ) . '</a>';
+				$actions['quickedit'] = '<a onclick="window.commentReply && commentReply.open( \''.$comment->comment_ID.'\',\''.$post->ID.'\',\'edit\' );return false;" class="vim-q" title="'.esc_attr__( 'Quick Edit' ).'" href="#">' . __( 'Quick&nbsp;Edit' ) . '</a>';
+				$actions['reply'] = '<a onclick="window.commentReply && commentReply.open( \''.$comment->comment_ID.'\',\''.$post->ID.'\' );return false;" class="vim-r" title="'.esc_attr__( 'Reply to this comment' ).'" href="#">' . __( 'Reply' ) . '</a>';
 			}
 
 			/** This filter is documented in wp-admin/includes/dashboard.php */
diff --git a/src/wp-admin/includes/dashboard.php b/src/wp-admin/includes/dashboard.php
index 5851e11e0a..fb50197e17 100644
--- a/src/wp-admin/includes/dashboard.php
+++ b/src/wp-admin/includes/dashboard.php
@@ -565,7 +565,7 @@ function _wp_dashboard_recent_comments_row( &$comment, $show_date = true ) {
 		$actions['approve'] = "<a href='$approve_url' data-wp-lists='dim:the-comment-list:comment-$comment->comment_ID:unapproved:e7e7d3:e7e7d3:new=approved' class='vim-a' title='" . esc_attr__( 'Approve this comment' ) . "'>" . __( 'Approve' ) . '</a>';
 		$actions['unapprove'] = "<a href='$unapprove_url' data-wp-lists='dim:the-comment-list:comment-$comment->comment_ID:unapproved:e7e7d3:e7e7d3:new=unapproved' class='vim-u' title='" . esc_attr__( 'Unapprove this comment' ) . "'>" . __( 'Unapprove' ) . '</a>';
 		$actions['edit'] = "<a href='comment.php?action=editcomment&amp;c={$comment->comment_ID}' title='" . esc_attr__('Edit comment') . "'>". __('Edit') . '</a>';
-		$actions['reply'] = '<a onclick="commentReply.open(\''.$comment->comment_ID.'\',\''.$comment->comment_post_ID.'\');return false;" class="vim-r hide-if-no-js" title="'.esc_attr__('Reply to this comment').'" href="#">' . __('Reply') . '</a>';
+		$actions['reply'] = '<a onclick="window.commentReply && commentReply.open(\''.$comment->comment_ID.'\',\''.$comment->comment_post_ID.'\');return false;" class="vim-r hide-if-no-js" title="'.esc_attr__('Reply to this comment').'" href="#">' . __('Reply') . '</a>';
 		$actions['spam'] = "<a href='$spam_url' data-wp-lists='delete:the-comment-list:comment-$comment->comment_ID::spam=1' class='vim-s vim-destructive' title='" . esc_attr__( 'Mark this comment as spam' ) . "'>" . /* translators: mark as spam link */ _x( 'Spam', 'verb' ) . '</a>';
 		if ( !EMPTY_TRASH_DAYS )
 			$actions['delete'] = "<a href='$delete_url' data-wp-lists='delete:the-comment-list:comment-$comment->comment_ID::trash=1' class='delete vim-d vim-destructive'>" . __('Delete Permanently') . '</a>';
diff --git a/src/wp-admin/includes/meta-boxes.php b/src/wp-admin/includes/meta-boxes.php
index 68d4611bae..be89c366bf 100644
--- a/src/wp-admin/includes/meta-boxes.php
+++ b/src/wp-admin/includes/meta-boxes.php
@@ -593,7 +593,7 @@ function post_comment_meta_box( $post ) {
 
 	wp_nonce_field( 'get-comments', 'add_comment_nonce', false );
 	?>
-	<p class="hide-if-no-js" id="add-new-comment"><a class="button" href="#commentstatusdiv" onclick="commentReply.addcomment(<?php echo $post->ID; ?>);return false;"><?php _e('Add comment'); ?></a></p>
+	<p class="hide-if-no-js" id="add-new-comment"><a class="button" href="#commentstatusdiv" onclick="window.commentReply && commentReply.addcomment(<?php echo $post->ID; ?>);return false;"><?php _e('Add comment'); ?></a></p>
 	<?php
 
 	$total = get_comments( array( 'post_id' => $post->ID, 'number' => 1, 'count' => true ) );