--- xmlsec.orig/php_xmlsec.c	2006-10-19 09:36:38.000000000 +0400
+++ xmlsec/php_xmlsec.c	2007-12-03 15:36:34.000000000 +0300
@@ -490,6 +490,9 @@
 			zend_throw_exception(PHP_XMLSEC_EXCEPTION, "String could not be parsed as XML", 0 TSRMLS_CC);
 			return;
 		}
+	} else {
+		zend_throw_exception(PHP_XMLSEC_EXCEPTION, "Empty string supplied as XML", 0 TSRMLS_CC);
+		return;
 	}
 
 	intern = (xmlsec_encryptor_object *)zend_object_store_get_object(id TSRMLS_CC);