diff --git a/clients/tui/nmt-address-list.c b/clients/tui/nmt-address-list.c
index ea775f534..42873c521 100644
--- a/clients/tui/nmt-address-list.c
+++ b/clients/tui/nmt-address-list.c
@@ -172,7 +172,7 @@ nmt_address_list_add_clicked (NmtWidgetList *list)
 	NmtAddressListPrivate *priv = NMT_ADDRESS_LIST_GET_PRIVATE (list);
 	int len;
 
-	len = g_strv_length (priv->strings);
+	len = priv->strings ? g_strv_length (priv->strings) : 0;
 	priv->strings = g_renew (char *, priv->strings, len + 2);
 	priv->strings[len] = g_strdup ("");
 	priv->strings[len + 1] = NULL;