From ca03d7e0d724c5c34f4b688b22fbfa0451cb9555 Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Tue, 15 Jan 2019 15:13:58 -0300
Subject: Ensure canvas copy texscreen will not crash if render target is
 configured without copy buffers. Closes #24749.

---
 drivers/gles3/rasterizer_canvas_gles3.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gles3/rasterizer_canvas_gles3.cpp b/drivers/gles3/rasterizer_canvas_gles3.cpp
index bc1883b09d..06b84aeab4 100644
--- a/drivers/gles3/rasterizer_canvas_gles3.cpp
+++ b/drivers/gles3/rasterizer_canvas_gles3.cpp
@@ -1144,6 +1144,11 @@ void RasterizerCanvasGLES3::_canvas_item_render_commands(Item *p_item, Item *cur
 
 void RasterizerCanvasGLES3::_copy_texscreen(const Rect2 &p_rect) {
 
+	if (storage->frame.current_rt->effects.mip_maps[0].sizes.size() == 0) {
+		ERR_EXPLAIN("Can't use screen texture copying in a render target configured without copy buffers");
+		ERR_FAIL();
+	}
+
 	glDisable(GL_BLEND);
 
 	state.canvas_texscreen_used = true;
-- 
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