From 30cb3fbf55c43f2d5154f201c03d6f0f78e4180e Mon Sep 17 00:00:00 2001
From: Andrew Harvey <andrew@alantgeo.com.au>
Date: Thu, 28 Feb 2019 22:26:38 +1100
Subject: [PATCH] fix flow

---
 src/render/draw_debug.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/render/draw_debug.js b/src/render/draw_debug.js
index b039bd457d9..58266cf6f10 100644
--- a/src/render/draw_debug.js
+++ b/src/render/draw_debug.js
@@ -40,7 +40,9 @@ function drawDebugTile(painter, sourceCache, coord) {
         debugUniformValues(posMatrix, Color.red), id,
         painter.debugBuffer, painter.tileBorderIndexBuffer, painter.debugSegments);
 
-    const tileSizeKb = Math.floor(sourceCache.getTileByID(coord.key).latestRawTileData && sourceCache.getTileByID(coord.key).latestRawTileData.byteLength / 1024);
+    const tileRawData = sourceCache.getTileByID(coord.key).latestRawTileData;
+    const tileByteLength = (tileRawData && tileRawData.byteLength) || 0;
+    const tileSizeKb = Math.floor(tileByteLength / 1024);
     const vertices = createTextVertices(`${coord.toString()} ${tileSizeKb}kb`, 50, 200, 5);
     const debugTextArray = new PosArray();
     const debugTextIndices = new LineIndexArray();