diff --git a/CHANGELOG.md b/CHANGELOG.md
index f9af6f3bb654f9e8ad80152e95292e34db1b34e3..e00b9e4e1df8633671e2d87578f3e0105eb88020 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1 +1,4 @@
-# v2.16.7
+# v2.16.6
+
+* trace_exception can take None as an argument
+* added option to specify a custom metric source for 
diff --git a/satella/instrumentation/metrics/exporters/prometheus.py b/satella/instrumentation/metrics/exporters/prometheus.py
index 41d28c93eea133d8b143e960a83a9d98f150c762..ad2221792b780f3ea596c5a300f9c430da01eb75 100644
--- a/satella/instrumentation/metrics/exporters/prometheus.py
+++ b/satella/instrumentation/metrics/exporters/prometheus.py
@@ -54,7 +54,7 @@ class PrometheusHTTPExporterThread(TerminableThread):
 
         class HTTPServer(http.server.HTTPServer):
             def __init__(self):
-                super().__init__((self.interface, self.port), PrometheusHandler,
+                super().__init__((self_2.interface, self_2.port), PrometheusHandler,
                                  bind_and_activate=False)
 
             def get_metric_data(self):