From eacabe83a1ededdecbe1b509fc105133a24eb5f2 Mon Sep 17 00:00:00 2001
From: neverland <chenjiahan@buaa.edu.cn>
Date: Mon, 10 Dec 2018 10:27:46 +0800
Subject: [PATCH] [bugfix] Swipe: add defensive code (#2253)

---
 packages/swipe/index.vue | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/packages/swipe/index.vue b/packages/swipe/index.vue
index 234ef33e0..097d00b79 100644
--- a/packages/swipe/index.vue
+++ b/packages/swipe/index.vue
@@ -220,9 +220,13 @@ export default create({
         return;
       }
 
-      swipes[0].offset = atLast && (delta < 0 || move > 0) ? trackSize : 0;
-      swipes[count - 1].offset =
-        atFirst && (delta > 0 || move < 0) ? -trackSize : 0;
+      if (swipes[0]) {
+        swipes[0].offset = atLast && (delta < 0 || move > 0) ? trackSize : 0;
+      }
+
+      if (swipes[count - 1]) {
+        swipes[count - 1].offset = atFirst && (delta > 0 || move < 0) ? -trackSize : 0;
+      }
 
       if (move && active + move >= -1 && active + move <= count) {
         this.active += move;