diff --git a/htdocs/public/project/suggestconference.php b/htdocs/public/project/suggestconference.php
index f0b9299f980..bcff02859a0 100644
--- a/htdocs/public/project/suggestconference.php
+++ b/htdocs/public/project/suggestconference.php
@@ -359,7 +359,37 @@ if (empty($reshook) && $action == 'add') {
 			$conforbooth->tms = dol_now();
 			$conforbooth->firstname = $contact->firstname;
 			$conforbooth->lastname = $contact->lastname;
-			$resultconforbooth = $conforbooth->create($user);
+			$conforbooth->ip = getUserRemoteIP();
+			$nb_post_max = getDolGlobalInt("MAIN_SECURITY_MAX_POST_ON_PUBLIC_PAGES_BY_IP_ADDRESS", 1000);
+
+			// Calculate nb of post for IP
+			$nb_post_ip = 0;
+			if ($nb_post_max > 0) {	// Calculate only if there is a limit to check
+				$sql = "SELECT COUNT(ref) as nb_confs";
+				$sql .= " FROM ".MAIN_DB_PREFIX."actioncomm";
+				$sql .= " WHERE ip = '".$db->escape($conforbooth->ip)."'";
+				$resql = $db->query($sql);
+				if ($resql) {
+					$num = $db->num_rows($resql);
+					$i = 0;
+					while ($i < $num) {
+						$i++;
+						$obj = $db->fetch_object($resql);
+						$nb_post_ip = $obj->nb_confs;
+					}
+				}
+			}
+
+			$resultconforbooth = 0;
+
+			if ($nb_post_max > 0 && $nb_post_ip >= $nb_post_max) {
+				$error++;
+				$errmsg .= $langs->trans("AlreadyTooMuchPostOnThisIPAdress");
+				array_push($conforbooth->errors, $langs->trans("AlreadyTooMuchPostOnThisIPAdress"));
+				setEventMessage($errmsg, 'errors');
+			} else {
+				$resultconforbooth = $conforbooth->create($user);
+			}
 			if ($resultconforbooth<=0) {
 				$error++;
 				$errmsg .= $conforbooth->error;