Index: src/wp-admin/includes/class-wp-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-list-table.php	(revision 32720)
+++ src/wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -850,8 +850,8 @@
 	 * @return array
 	 */
 	protected function get_column_info() {
-		if ( isset( $this->_column_headers ) && is_array( $this->_column_headers ) && count( $this->_column_headers ) >= 4 ) {
-			return $this->_column_headers;
+		if ( isset( $this->_column_headers ) && is_array( $this->_column_headers ) ) {
+			return array_replace( array( array(), array(), array(), null ), $this->_column_headers );
 		}
 
 		$columns = get_column_headers( $this->screen );