diff --git a/library/x509_crt.c b/library/x509_crt.c
index 708dbf7..dfd22f6 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -681,6 +681,7 @@
                                           sizeof( mbedtls_x509_sequence ) );
                 mbedtls_free( seq_prv );
             }
+            subject_alt_name->next = NULL;
             return( ret );
         }