Index: wp-includes/general-template.php
===================================================================
--- wp-includes/general-template.php	(revision 14181)
+++ wp-includes/general-template.php	(working copy)
@@ -1063,6 +1063,7 @@
 		if ( is_array($cache) && isset( $cache[ $key ] ) ) {
 			if ( $echo )
 				echo apply_filters( 'get_calendar',  $cache[$key] );
+				return;
 			else
 				return apply_filters( 'get_calendar',  $cache[$key] );
 		}