diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index ff19d404c..e16296fc1 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -1112,8 +1112,8 @@
       while (++index < length) {
         var value = array[index];
 
-        // recursively flatten arrays (susceptible to call stack limits)
-        if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
+        if (value && typeof value == 'object' && value.length && (isArray(value) || isArguments(value))) {
+          // recursively flatten arrays (susceptible to call stack limits)
           if (!isShallow) {
             value = baseFlatten(value, isShallow, isArgArrays);
           }
@@ -1745,12 +1745,14 @@
      * // => false
      */
     function isArguments(value) {
-      return (value && typeof value == 'object') ? toString.call(value) == argsClass : false;
+      return value && typeof value == 'object' && typeof value.length == 'number' &&
+        toString.call(value) == argsClass || false;
     }
     // fallback for browsers that can't detect `arguments` objects by [[Class]]
     if (!support.argsClass) {
       isArguments = function(value) {
-        return (value && typeof value == 'object') ? hasOwnProperty.call(value, 'callee') : false;
+        return value && typeof value == 'object' && typeof value.length == 'number' &&
+          hasOwnProperty.call(value, 'callee') || false;
       };
     }
 
@@ -1772,7 +1774,8 @@
      * // => true
      */
     var isArray = nativeIsArray || function(value) {
-      return (value && typeof value == 'object') ? toString.call(value) == arrayClass : false;
+      return value && typeof value == 'object' && typeof value.length == 'number' &&
+        toString.call(value) == arrayClass || false;
     };
 
     /**
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index e4a7bd6eb..758e8e6c4 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -3,54 +3,54 @@
  * Lo-Dash 2.0.0 (Custom Build) lodash.com/license | Underscore.js 1.5.2 underscorejs.org/LICENSE
  * Build: `lodash -o ./dist/lodash.compat.js`
  */
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diff --git a/dist/lodash.js b/dist/lodash.js
index d1c81dfbe..6e9e684ce 100644
--- a/dist/lodash.js
+++ b/dist/lodash.js
@@ -843,8 +843,8 @@
       while (++index < length) {
         var value = array[index];
 
-        // recursively flatten arrays (susceptible to call stack limits)
-        if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
+        if (value && typeof value == 'object' && value.length && (isArray(value) || isArguments(value))) {
+          // recursively flatten arrays (susceptible to call stack limits)
           if (!isShallow) {
             value = baseFlatten(value, isShallow, isArgArrays);
           }
@@ -1401,7 +1401,8 @@
      * // => false
      */
     function isArguments(value) {
-      return (value && typeof value == 'object') ? toString.call(value) == argsClass : false;
+      return value && typeof value == 'object' && typeof value.length == 'number' &&
+        toString.call(value) == argsClass || false;
     }
 
     /**
@@ -1422,7 +1423,8 @@
      * // => true
      */
     var isArray = nativeIsArray || function(value) {
-      return (value && typeof value == 'object') ? toString.call(value) == arrayClass : false;
+      return value && typeof value == 'object' && typeof value.length == 'number' &&
+        toString.call(value) == arrayClass || false;
     };
 
     /**
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index 3536055c4..a53527fb6 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
@@ -3,50 +3,50 @@
  * Lo-Dash 2.0.0 (Custom Build) lodash.com/license | Underscore.js 1.5.2 underscorejs.org/LICENSE
  * Build: `lodash modern -o ./dist/lodash.js`
  */
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diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index 61f9320ab..c49e6d656 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -419,8 +419,8 @@
     while (++index < length) {
       var value = array[index];
 
-      // recursively flatten arrays (susceptible to call stack limits)
-      if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
+      if (value && typeof value == 'object' && value.length && (isArray(value) || isArguments(value))) {
+        // recursively flatten arrays (susceptible to call stack limits)
         if (!isShallow) {
           value = baseFlatten(value, isShallow, isArgArrays);
         }
@@ -784,12 +784,14 @@
    * // => false
    */
   function isArguments(value) {
-    return (value && typeof value == 'object') ? toString.call(value) == argsClass : false;
+    return value && typeof value == 'object' && typeof value.length == 'number' &&
+      toString.call(value) == argsClass || false;
   }
   // fallback for browsers that can't detect `arguments` objects by [[Class]]
   if (!isArguments(arguments)) {
     isArguments = function(value) {
-      return (value && typeof value == 'object') ? hasOwnProperty.call(value, 'callee') : false;
+      return value && typeof value == 'object' && typeof value.length == 'number' &&
+        hasOwnProperty.call(value, 'callee') || false;
     };
   }
 
@@ -811,7 +813,8 @@
    * // => true
    */
   var isArray = nativeIsArray || function(value) {
-    return (value && typeof value == 'object') ? toString.call(value) == arrayClass : false;
+    return value && typeof value == 'object' && typeof value.length == 'number' &&
+      toString.call(value) == arrayClass || false;
   };
 
   /**
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index ac42fdfa1..ba83d663b 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -4,34 +4,35 @@
  * Build: `lodash underscore exports="amd,commonjs,global,node" -o ./dist/lodash.underscore.js`
  */
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+}}),R(["concat","join","slice"],function(n){var r=dr[n];u.prototype[n]=function(){var n=r.apply(this.__wrapped__,arguments);return this.__chain__&&(n=new o(n),n.__chain__=!0),n}}),typeof define=="function"&&typeof define.amd=="object"&&define.amd?(gr._=u, define(function(){return u})):yr&&!yr.nodeType?mr?(mr.exports=u)._=u:yr._=u:gr._=u}).call(this);
\ No newline at end of file
diff --git a/lodash.js b/lodash.js
index e424d1b7b..becd50a7c 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1131,8 +1131,8 @@
       while (++index < length) {
         var value = array[index];
 
-        // recursively flatten arrays (susceptible to call stack limits)
-        if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
+        if (value && typeof value == 'object' && value.length && (isArray(value) || isArguments(value))) {
+          // recursively flatten arrays (susceptible to call stack limits)
           if (!isShallow) {
             value = baseFlatten(value, isShallow, isArgArrays);
           }
@@ -1765,12 +1765,14 @@
      * // => false
      */
     function isArguments(value) {
-      return (value && typeof value == 'object') ? toString.call(value) == argsClass : false;
+      return value && typeof value == 'object' && typeof value.length == 'number' &&
+        toString.call(value) == argsClass || false;
     }
     // fallback for browsers that can't detect `arguments` objects by [[Class]]
     if (!support.argsClass) {
       isArguments = function(value) {
-        return (value && typeof value == 'object') ? hasOwnProperty.call(value, 'callee') : false;
+        return value && typeof value == 'object' && typeof value.length == 'number' &&
+          hasOwnProperty.call(value, 'callee') || false;
       };
     }
 
@@ -1792,7 +1794,8 @@
      * // => true
      */
     var isArray = nativeIsArray || function(value) {
-      return (value && typeof value == 'object') ? toString.call(value) == arrayClass : false;
+      return value && typeof value == 'object' && typeof value.length == 'number' &&
+        toString.call(value) == arrayClass || false;
     };
 
     /**
diff --git a/perf/perf.js b/perf/perf.js
index 4d7d31d3b..1479af3cc 100644
--- a/perf/perf.js
+++ b/perf/perf.js
@@ -270,6 +270,7 @@
           numbers = Array(limit),\
           fourNumbers = [5, 25, 10, 30],\
           nestedNumbers = [1, [2], [3, [[4]]]],\
+          nestedObjects = [{}, [{}], [{}, [[{}]]]],\
           twoNumbers = [12, 23];\
       \
       for (index = 0; index < limit; index++) {\
@@ -1025,6 +1026,16 @@
       )
   );
 
+  suites.push(
+    Benchmark.Suite('`_.flatten` with objects')
+      .add(buildName, '\
+        lodash.flatten(nestedObjects)'
+      )
+      .add(otherName, '\
+        _.flatten(nestedObjects)'
+      )
+  );
+
   suites.push(
     Benchmark.Suite('`_.flatten` with `shallow`')
       .add(buildName, '\