diff --git a/prometheus_client/exposition.py b/prometheus_client/exposition.py
index 4a799308..4aebec3f 100644
--- a/prometheus_client/exposition.py
+++ b/prometheus_client/exposition.py
@@ -89,7 +89,14 @@ def generate_latest(registry=REGISTRY):
     """Returns the metrics from the registry in latest text format as a string."""
 
     def sample_line(line):
+        if 'timestamp' in line and line['timestamp'] is None:
+            line['timestamp'] = "00:00"
+        if 'exemplar' in line and line['exemplar'] is None:
+            line['exemplar'] = "0"
         if line.labels:
+            # change None to something idk?
+            if 'method' in line.labels and line.labels['method'] is None:
+                line.labels['method'] = "GET request"
             labelstr = '{{{0}}}'.format(','.join(
                 ['{0}="{1}"'.format(
                     k, v.replace('\\', r'\\').replace('\n', r'\n').replace('"', r'\"'))
diff --git a/prometheus_client/openmetrics/exposition.py b/prometheus_client/openmetrics/exposition.py
index 6d5925ed..f30d0cde 100644
--- a/prometheus_client/openmetrics/exposition.py
+++ b/prometheus_client/openmetrics/exposition.py
@@ -21,6 +21,8 @@ def generate_latest(registry):
                 output.append('# UNIT {0} {1}\n'.format(mname, metric.unit))
             for s in metric.samples:
                 if s.labels:
+                    if 'method' in s.labels and s.labels['method'] is None:
+                        s.labels['method'] = "GET request"
                     labelstr = '{{{0}}}'.format(','.join(
                         ['{0}="{1}"'.format(
                             k, v.replace('\\', r'\\').replace('\n', r'\n').replace('"', r'\"'))