diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index 11c4ac73a0..eba4e1fd5f 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -1241,6 +1241,11 @@ Object* CallStubCompiler::CompileArrayPushCall(Object* object,
   // -----------------------------------
   ASSERT(check == RECEIVER_MAP_CHECK);
 
+  // If object is not an array, bail out to regular call.
+  if (!object->IsJSArray()) {
+    return Heap::undefined_value();
+  }
+
   Label miss;
 
   // Get the receiver from the stack.
@@ -1389,6 +1394,11 @@ Object* CallStubCompiler::CompileArrayPopCall(Object* object,
   // -----------------------------------
   ASSERT(check == RECEIVER_MAP_CHECK);
 
+  // If object is not an array, bail out to regular call.
+  if (!object->IsJSArray()) {
+    return Heap::undefined_value();
+  }
+
   Label miss, empty_array, call_builtin;
 
   // Get the receiver from the stack.
@@ -1476,7 +1486,11 @@ Object* CallStubCompiler::CompileCallConstant(Object* object,
   if (function_info->HasCustomCallGenerator()) {
     CustomCallGenerator generator =
         ToCData<CustomCallGenerator>(function_info->function_data());
-    return generator(this, object, holder, function, name, check);
+    Object* result = generator(this, object, holder, function, name, check);
+    // undefined means bail out to regular compiler.
+    if (!result->IsUndefined()) {
+      return result;
+    }
   }
 
   Label miss_in_smi_check;
diff --git a/test/mjsunit/array-pop.js b/test/mjsunit/array-pop.js
index 4edd02614b..9608cd4ce5 100644
--- a/test/mjsunit/array-pop.js
+++ b/test/mjsunit/array-pop.js
@@ -59,3 +59,14 @@
     assertEquals(0, a.length, "length 9th pop");
   }
 })();
+
+// Test the case of not JSArray receiver.
+// Regression test for custom call generators, see issue 684.
+(function() {
+  var a = [];
+  for (var i = 0; i < 100; i++) a.push(i);
+  var x = {__proto__: a};
+  for (var i = 0; i < 100; i++) {
+    assertEquals(99 - i, x.pop(), i + 'th iteration');
+  }
+})();
diff --git a/test/mjsunit/array-push.js b/test/mjsunit/array-push.js
index baccf000c4..2a25a9cc9e 100644
--- a/test/mjsunit/array-push.js
+++ b/test/mjsunit/array-push.js
@@ -103,3 +103,13 @@
     assertEquals(29, a.push(29));
   }
 })();
+
+// Test the case of not JSArray receiver.
+// Regression test for custom call generators, see issue 684.
+(function() {
+  var x = {__proto__: []};
+  for (var i = 0; i < 100; i++) {
+    x.push("a");
+    assertEquals(i + 1, x.length, i + 'th iteration');
+  }
+})();