diff --git a/jerry-core/ecma/builtin-objects/ecma-builtin-json.cpp b/jerry-core/ecma/builtin-objects/ecma-builtin-json.cpp
index 3420096f2..3fe966e5e 100644
--- a/jerry-core/ecma/builtin-objects/ecma-builtin-json.cpp
+++ b/jerry-core/ecma/builtin-objects/ecma-builtin-json.cpp
@@ -1129,7 +1129,7 @@ ecma_builtin_json_quote (ecma_string_t *string_p) /**< string that should be quo
   ssize_t bytes_copied = ecma_string_to_utf8_string (string_p,
                                                      zt_string_buff,
                                                      (ssize_t) string_buf_size);
-  JERRY_ASSERT (bytes_copied > 0);
+  JERRY_ASSERT (bytes_copied > 0 || !string_len);
 
   /* 2. */
   for (ecma_length_t i = 0; i < string_len; i++)
diff --git a/tests/jerry/json-stringify.js b/tests/jerry/json-stringify.js
index c02659349..6902476ee 100644
--- a/tests/jerry/json-stringify.js
+++ b/tests/jerry/json-stringify.js
@@ -14,6 +14,8 @@
 // limitations under the License.
 
 // Checking quoting strings
+assert (JSON.stringify ("") === '""');
+
 normal_string = "asdasd";
 assert (JSON.stringify (normal_string) == '"asdasd"');