diff --git src/bp-templates/bp-legacy/buddypress-functions.php src/bp-templates/bp-legacy/buddypress-functions.php
index 47bc605..c59816f 100644
--- src/bp-templates/bp-legacy/buddypress-functions.php
+++ src/bp-templates/bp-legacy/buddypress-functions.php
@@ -719,7 +719,7 @@ function bp_legacy_theme_post_update() {
 			$activity_id = groups_post_update( array( 'content' => $_POST['content'], 'group_id' => $_POST['item_id'] ) );
 
 	} else {
-		$activity_id = apply_filters( 'bp_activity_custom_update', $_POST['object'], $_POST['item_id'], $_POST['content'] );
+		$activity_id = apply_filters( 'bp_activity_custom_update', false, $_POST['object'], $_POST['item_id'], $_POST['content'] );
 	}
 
 	if ( empty( $activity_id ) )