diff --git a/jerry-core/ecma/operations/ecma-function-object.cpp b/jerry-core/ecma/operations/ecma-function-object.cpp
index cdc734c16..412c4d9fa 100644
--- a/jerry-core/ecma/operations/ecma-function-object.cpp
+++ b/jerry-core/ecma/operations/ecma-function-object.cpp
@@ -833,7 +833,8 @@ ecma_op_function_has_instance (ecma_object_t *func_obj_p, /**< Function object *
 
     ecma_deref_ecma_string (prototype_magic_string_p);
   }
-  else if (ecma_get_object_type (func_obj_p) == ECMA_OBJECT_TYPE_BUILT_IN_FUNCTION)
+  else if (ecma_get_object_type (func_obj_p) == ECMA_OBJECT_TYPE_BUILT_IN_FUNCTION ||
+           ecma_get_object_type (func_obj_p) == ECMA_OBJECT_TYPE_EXTERNAL_FUNCTION)
   {
     ret_value = ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_TYPE));
   }
diff --git a/tests/jerry/regression-test-issue-736.js b/tests/jerry/regression-test-issue-736.js
new file mode 100644
index 000000000..8997cc900
--- /dev/null
+++ b/tests/jerry/regression-test-issue-736.js
@@ -0,0 +1,39 @@
+// Copyright 2015 Samsung Electronics Co., Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var code = 'try\n\
+{\n\
+  print({toStSing:!function() { throw new TypeError("foo"); }}, []);t (false);\n\
+}\n\
+catch (e)\n\
+{\n\
+  assert*(e instanceof\n\
+  assert );\n\
+  asstrt (e.a%e === "foo");\n\
+}';
+
+try {
+  eval(code);
+  assert(false);
+} catch(e) {
+  assert(e instanceof TypeError);
+}
+
+try {
+  eval("var x; x instanceof assert;");
+  assert(false);
+} catch(e) {
+  assert(e instanceof TypeError);
+}
+