From 681ee5a89a89dbaf435aab4a93425104ec0ae928 Mon Sep 17 00:00:00 2001
From: Bryan Housel <bryan@mapbox.com>
Date: Wed, 22 Mar 2017 10:27:15 -0400
Subject: [PATCH] Prevent crash when missing datum (This can happen if the user
 mouseups on a tooltip, e.g. in walkthrough)

---
 modules/behavior/select.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules/behavior/select.js b/modules/behavior/select.js
index 59273d144..a24412778 100644
--- a/modules/behavior/select.js
+++ b/modules/behavior/select.js
@@ -74,8 +74,8 @@ export function behaviorSelect(context) {
             mode = context.mode();
 
 
-        if (datum.type === 'midpoint') {
-            // clicked midpoint, do nothing..
+        if (!datum || datum.type === 'midpoint') {
+            // do nothing..
 
         } else if (!(datum instanceof osmEntity)) {
             // clicked nothing..