diff --git a/jerry-core/vm/vm.c b/jerry-core/vm/vm.c
index 695f69a14..b5a1aa5bc 100644
--- a/jerry-core/vm/vm.c
+++ b/jerry-core/vm/vm.c
@@ -625,11 +625,11 @@ vm_init_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
 
             ecma_object_t *ref_base_lex_env_p = ecma_op_resolve_reference_base (frame_ctx_p->lex_env_p, name_p);
 
-            /* TODO: check the return value */
-            ecma_op_put_value_lex_env_base (ref_base_lex_env_p,
-                                            name_p,
-                                            is_strict,
-                                            lit_value);
+            ecma_value_t put_value_result = ecma_op_put_value_lex_env_base (ref_base_lex_env_p,
+                                                                            name_p,
+                                                                            is_strict,
+                                                                            lit_value);
+            ecma_free_value (put_value_result);
           }
 
           if (value_index >= register_end)
diff --git a/tests/jerry/regression-test-issue-1387.js b/tests/jerry/regression-test-issue-1387.js
new file mode 100644
index 000000000..8985edcad
--- /dev/null
+++ b/tests/jerry/regression-test-issue-1387.js
@@ -0,0 +1,17 @@
+// Copyright 2016 Samsung Electronics Co., Ltd.
+// Copyright 2016 University of Szeged.
+//
+// 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.
+
+'use strict'
+function undefined () {}