From 915d7e7b8a6380fbb2b227814f6528b4c32a6fa9 Mon Sep 17 00:00:00 2001
From: Benjamin Michel <benjamin.michel@habx.fr>
Date: Tue, 9 Jan 2018 16:08:23 +0100
Subject: [PATCH 1/3] Prevent error when clicking a link to an anchor that does
 not exist

---
 src/scrollchor.jsx | 7 +++++--
 src/utils.js       | 7 +++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/scrollchor.jsx b/src/scrollchor.jsx
index f0e1cb3..2705976 100644
--- a/src/scrollchor.jsx
+++ b/src/scrollchor.jsx
@@ -40,8 +40,11 @@ export default class Scrollchor extends React.Component {
     this._beforeAnimate(event);
     event && event.preventDefault();
     const id = animateScroll(this._to, this._animate);
-    this._disableHistory || updateHistory(id);
-    this._afterAnimate(event);
+
+    if (id) {
+      this._disableHistory || updateHistory(id);
+      this._afterAnimate(event);
+    }
   }
 
   componentWillReceiveProps (props) {
diff --git a/src/utils.js b/src/utils.js
index 99291b2..60ddeaa 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -5,6 +5,10 @@ export function animateScroll (id, animate) {
   const element = id ? document.getElementById(id) : document.body;
   warning(element, `Cannot find element: #${id}`);
 
+  if (!element) {
+    return null
+  }
+
   const { offset, duration, easing } = animate;
   const start = getScrollTop();
   const to = getOffsetTop(element) + offset;
@@ -39,6 +43,9 @@ function setScrollTop (position) {
 }
 
 function getOffsetTop (element) {
+  if (!element) {
+    return
+  }
   const { top } = element.getBoundingClientRect();
   return top + getScrollTop();
 }

From 94439b4302c175f3ec3d634e335d1f99f6d72f45 Mon Sep 17 00:00:00 2001
From: Benjamin Michel <benjamin.michel@habx.fr>
Date: Tue, 9 Jan 2018 16:09:29 +0100
Subject: [PATCH 2/3] Removed useless test

---
 src/utils.js | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/src/utils.js b/src/utils.js
index 60ddeaa..2d72f19 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -43,9 +43,6 @@ function setScrollTop (position) {
 }
 
 function getOffsetTop (element) {
-  if (!element) {
-    return
-  }
   const { top } = element.getBoundingClientRect();
   return top + getScrollTop();
 }

From f83f2a6328158509efaf70392f0fac88020c8c22 Mon Sep 17 00:00:00 2001
From: Benjamin Michel <benjamin.michel@habx.fr>
Date: Tue, 9 Jan 2018 16:32:55 +0100
Subject: [PATCH 3/3] Fixed lint

---
 src/utils.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/utils.js b/src/utils.js
index 2d72f19..94beef0 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -6,7 +6,7 @@ export function animateScroll (id, animate) {
   warning(element, `Cannot find element: #${id}`);
 
   if (!element) {
-    return null
+    return null;
   }
 
   const { offset, duration, easing } = animate;