prevent duplicate friend suggestions

boot.php

@@ -9,7 +9,7 @@ require_once('include/nav.php');
 require_once('include/cache.php');
 
 define ( 'FRIENDICA_PLATFORM',     'Friendica');
-define ( 'FRIENDICA_VERSION',      '2.3.1290' );
+define ( 'FRIENDICA_VERSION',      '2.3.1291' );
 define ( 'DFRN_PROTOCOL_VERSION',  '2.23'    );
 define ( 'DB_UPDATE_VERSION',      1133      );
 

include/items.php

@@ -1898,6 +1898,14 @@ function local_delivery($importer,$data) {
 		);
 		if(count($r)) {
 			$fid = $r[0]['id'];
+
+			// OK, we do. Do we already have an introduction for this person ?
+			$r = q("select id from intro where uid = %d and fid = %d limit 1",
+				intval($fsugg['uid']),
+				intval($fid)
+			);
+			if(count($r))
+				return 0;
 		}
 		if(! $fid)
 			$r = q("INSERT INTO `fcontact` ( `name`,`url`,`photo`,`request` ) VALUES ( '%s', '%s', '%s', '%s' ) ",
@@ -1918,6 +1926,7 @@ function local_delivery($importer,$data) {
 		else
 			return 0;
 
+
 		$hash = random_string();
  
 		$r = q("INSERT INTO `intro` ( `uid`, `fid`, `contact-id`, `note`, `hash`, `datetime`, `blocked` )