diff --git a/jerry-core/parser/regexp/re-parser.c b/jerry-core/parser/regexp/re-parser.c
index cf215b6eb..0be83628b 100644
--- a/jerry-core/parser/regexp/re-parser.c
+++ b/jerry-core/parser/regexp/re-parser.c
@@ -913,6 +913,7 @@ re_parse_next_token (re_parser_ctx_t *parser_ctx_p, /**< RegExp parser context *
 
       if (!ecma_is_value_empty (ret_value))
       {
+        ecma_free_value (JERRY_CONTEXT (error_value));
         parser_ctx_p->input_curr_p = input_curr_p;
         ret_value = ECMA_VALUE_EMPTY;
       }
diff --git a/tests/jerry/regression-test-issue-2660.js b/tests/jerry/regression-test-issue-2660.js
new file mode 100644
index 000000000..9c06ba710
--- /dev/null
+++ b/tests/jerry/regression-test-issue-2660.js
@@ -0,0 +1,20 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// 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.
+
+try {
+  new RegExp("\{{91[06,456}");
+  assert (false);
+} catch (e) {
+  assert(e instanceof SyntaxError);
+}