diff --git a/src/auth.c b/src/auth.c
index bed48c23..8d795a46 100644
--- a/src/auth.c
+++ b/src/auth.c
@@ -1599,6 +1599,11 @@ static int kbdauth_send(ssh_session session) {
 
   enter_function();
 
+  if(session==NULL || session->kbdint == NULL
+                   || session->kbdint->answers == NULL) {
+    return rc;
+  }
+
   if (buffer_add_u8(session->out_buffer, SSH2_MSG_USERAUTH_INFO_RESPONSE) < 0 ||
       buffer_add_u32(session->out_buffer,
         htonl(session->kbdint->nprompts)) < 0) {