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-rw-r--r--rest/rest-proxy.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/rest/rest-proxy.c b/rest/rest-proxy.c
index 086c217..ca42aac 100644
--- a/rest/rest-proxy.c
+++ b/rest/rest-proxy.c
@@ -598,7 +598,11 @@ _rest_proxy_new_call (RestProxy *proxy)
RestProxyCall *
rest_proxy_new_call (RestProxy *proxy)
{
- RestProxyClass *proxy_class = REST_PROXY_GET_CLASS (proxy);
+ RestProxyClass *proxy_class;
+
+ g_return_val_if_fail (REST_IS_PROXY (proxy), NULL);
+
+ proxy_class = REST_PROXY_GET_CLASS (proxy);
return proxy_class->new_call (proxy);
}