### Eclipse Workspace Patch 1.0
#P wordpress
Index: wp-includes/pluggable.php
===================================================================
--- wp-includes/pluggable.php	(revision 15667)
+++ wp-includes/pluggable.php	(working copy)
@@ -178,7 +178,10 @@
 			$field = 'user_nicename';
 			break;
 		case 'email':
-			$user_id = wp_cache_get($value, 'useremail');
+			if ( strlen( $value ) )
+				$user_id = wp_cache_get($value, 'useremail');
+			else
+				return false;
 			$field = 'user_email';
 			break;
 		case 'login':