X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=mod%2Fregister.php;h=06ed1e0f18fb4bb936bd3fd627f8d9077e97e7eb;hb=a41b4c6e6726b1158a8d05f37c1630d67e462fe5;hp=95e9d581f1c9806e19d1818ed3da73f972252d9f;hpb=067626380db6d5ed71d68bd91481ff51cfa76915;p=friendica.git

diff --git a/mod/register.php b/mod/register.php
index 95e9d581f1..06ed1e0f18 100644
--- a/mod/register.php
+++ b/mod/register.php
@@ -199,6 +199,24 @@ function register_post(&$a) {
 		return;
 	} 		
 
+	/**
+	 * if somebody clicked submit twice very quickly, they could end up with two accounts 
+	 * due to race condition. Remove this one.
+	 */
+
+	$r = q("SELECT `uid` FROM `user`
+               	WHERE `nickname` = '%s' ",
+               	dbesc($nickname)
+	);
+	if((count($r) > 1) && $newuid) {
+		$err .= t('Nickname is already registered. Please choose another.') . EOL;
+		q("DELETE FROM `user` WHERE `uid` = %d LIMIT 1",
+			intval($newuid)
+		);
+		notice ($err);
+		return;
+	}
+
 	if(x($newuid) !== false) {
 		$r = q("INSERT INTO `profile` ( `uid`, `profile-name`, `is-default`, `name`, `photo`, `thumb`, `publish`, `net-publish` )
 			VALUES ( %d, '%s', %d, '%s', '%s', '%s', %d, %d ) ",