diff --git a/phpBB/includes/ucp/ucp_profile.php b/phpBB/includes/ucp/ucp_profile.php
index d8a131d09f..bba0b92332 100644
--- a/phpBB/includes/ucp/ucp_profile.php
+++ b/phpBB/includes/ucp/ucp_profile.php
@@ -406,7 +406,7 @@ class ucp_profile
 				$enable_bbcode	= ($config['allow_sig_bbcode']) ? request_var('enable_bbcode', $user->optionget('bbcode')) : false;
 				$enable_smilies	= ($config['allow_sig_smilies']) ? request_var('enable_smilies', $user->optionget('smilies')) : false;
 				$enable_urls	= request_var('enable_urls', true);
-				$signature		= request_var('signature', $user->data['user_sig'], true);
+				$signature		= request_var('signature', (string) $user->data['user_sig'], true);
 
 				if ($submit || $preview)
 				{
diff --git a/phpBB/includes/ucp/ucp_register.php b/phpBB/includes/ucp/ucp_register.php
index c8d37ddf07..d7292966ad 100644
--- a/phpBB/includes/ucp/ucp_register.php
+++ b/phpBB/includes/ucp/ucp_register.php
@@ -258,6 +258,10 @@ class ucp_register
 					'user_dst'				=> 0,
 					'user_colour'			=> '',
 					'user_avatar'			=> '',
+
+					'user_sig'					=> '',
+					'user_sig_bbcode_uid'		=> '',
+					'user_sig_bbcode_bitfield'	=> 0,
 				);
 
 				$sql = 'INSERT INTO ' . USERS_TABLE . ' ' . $db->sql_build_array('INSERT', $sql_ary);