From b8ef3801bc4181784721f45e4dd9e569de9128c6 Mon Sep 17 00:00:00 2001
From: Seungha Yang <seungha.yang@navercorp.com>
Date: Mon, 23 Dec 2019 15:17:07 +0900
Subject: [PATCH] vulkansink: Fix null pointer exception

context query might happen before creating swapper.
---
 ext/vulkan/vksink.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ext/vulkan/vksink.c b/ext/vulkan/vksink.c
index 3a09ebbd5f..b7d2c27a63 100644
--- a/ext/vulkan/vksink.c
+++ b/ext/vulkan/vksink.c
@@ -231,7 +231,8 @@ gst_vulkan_sink_query (GstBaseSink * bsink, GstQuery * query)
       if (gst_vulkan_handle_context_query (GST_ELEMENT (vk_sink), query,
               vk_sink->display, vk_sink->instance, vk_sink->device))
         return TRUE;
-      if (gst_vulkan_queue_handle_context_query (GST_ELEMENT (vk_sink), query,
+      if (vk_sink->swapper &&
+          gst_vulkan_queue_handle_context_query (GST_ELEMENT (vk_sink), query,
               vk_sink->swapper->queue))
         return TRUE;