From 1043402b8890de4feade1634b841a178a7d1cebd Mon Sep 17 00:00:00 2001
From: Bryan Housel <bryan@mapbox.com>
Date: Tue, 1 Nov 2016 21:42:37 -0400
Subject: [PATCH] Don't call behavior.off unless behaviors were actually added

---
 modules/ui/fields/restrictions.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/modules/ui/fields/restrictions.js b/modules/ui/fields/restrictions.js
index 77a3da820..8a473d88f 100644
--- a/modules/ui/fields/restrictions.js
+++ b/modules/ui/fields/restrictions.js
@@ -43,6 +43,7 @@ export function uiFieldRestrictions(field, context) {
     var dispatch = d3.dispatch('change'),
         breathe = behaviorBreathe(context),
         hover = behaviorHover(context),
+        initialized = false,
         vertexID,
         fromNodeID;
 
@@ -100,6 +101,7 @@ export function uiFieldRestrictions(field, context) {
         var surface = wrap.selectAll('.surface');
 
         if (!enter.empty()) {
+            initialized = true;
             surface
                 .call(breathe)
                 .call(hover);
@@ -222,6 +224,8 @@ export function uiFieldRestrictions(field, context) {
 
 
     restrictions.off = function(selection) {
+        if (!initialized) return;
+
         selection.selectAll('.surface')
             .call(hover.off)
             .call(breathe.off)