diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index ea74ac9..701d27d 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -589,6 +589,12 @@
 
     MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite requires certificate" ) );
 
+    if( list == NULL )
+    {
+        MBEDTLS_SSL_DEBUG_MSG( 3, ( "server has no certificate" ) );
+        return( -1 );
+    }
+
     for( cur = list; cur != NULL; cur = cur->next )
     {
         MBEDTLS_SSL_DEBUG_CRT( 3, "candidate certificate chain, certificate",
@@ -649,7 +655,6 @@
     if( cur == NULL )
         cur = fallback;
 
-
     /* Do not update ssl->handshake->key_cert unless there is a match */
     if( cur != NULL )
     {