fix collision debug rendering

mapbox · Nov 10, 2016 · bb08803 · bb08803
1 parent 810e504
commit bb08803
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/js/render/draw_collision_debug.js b/js/render/draw_collision_debug.js
@@ -12,6 +12,8 @@ function drawCollisionDebug(painter, sourceCache, layer, coords) {
         const tile = sourceCache.getTile(coord);
         const bucket = tile.getBucket(layer);
         if (!bucket) continue;
+        const buffers = bucket.buffers.collisionBox;
+        if (!buffers) continue;
 
         gl.uniformMatrix4fv(program.u_matrix, false, coord.posMatrix);
 
@@ -22,7 +24,6 @@ function drawCollisionDebug(painter, sourceCache, layer, coords) {
         gl.uniform1f(program.u_zoom, painter.transform.zoom * 10);
         gl.uniform1f(program.u_maxzoom, (tile.coord.z + 1) * 10);
 
-        const buffers = bucket.buffers.collisionBox;
         for (const segment of buffers.segments) {
             segment.vaos[layer.id].bind(gl, program, buffers.layoutVertexBuffer, buffers.elementBuffer, null, segment.vertexOffset);
             gl.drawElements(gl.LINES, segment.primitiveLength * 2, gl.UNSIGNED_SHORT, segment.primitiveOffset * 2 * 2);