From cd69a53406f86bf8765704fe84523472d4086619 Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Fri, 16 Jan 2015 03:11:59 -0800
Subject: [PATCH] Guard against nullish value being passed to `arrayCopy` in
 `baseMergeDeep`.

---
 lodash.src.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lodash.src.js b/lodash.src.js
index a1ea1acf5..04237b4b3 100644
--- a/lodash.src.js
+++ b/lodash.src.js
@@ -2522,8 +2522,11 @@
       if (isCommon) {
         result = srcValue;
         if (isLength(srcValue.length) && (isArray(srcValue) || isTypedArray(srcValue))) {
-          result = isArray(value) ? value : arrayCopy(value);
-        } else if (isPlainObject(srcValue) || isArguments(srcValue)) {
+          result = isArray(value)
+            ? value
+            : (value ? arrayCopy(value) : []);
+        }
+        else if (isPlainObject(srcValue) || isArguments(srcValue)) {
           result = isArguments(value)
             ? arrayToObject(value)
             : (isPlainObject(value) ? value : {});