diff --git a/src/wordpress_result_transformer.rb b/src/wordpress_result_transformer.rb
index 39ff27d..10bc07e 100644
--- a/src/wordpress_result_transformer.rb
+++ b/src/wordpress_result_transformer.rb
@@ -25,8 +25,8 @@ def transform(r, timed_out: false)
             requests_done: r.dig('requests_done').to_s,
             db_update_finished: r.dig('db_update_finished').to_s,
             version: r.dig('version', 'number').to_s,
-            start_time: Time.at(r.dig('start_time')),
-            end_time: Time.at(r.dig('stop_time'))
+            start_time: r.dig('start_time').nil? ? nil : Time.at(r.dig('start_time')),
+            end_time: r.dig('stop_time').nil? ? nil : Time.at(r.dig('stop_time'))
         }
     }
     unless r.dig('version').nil? or r.dig('version').empty?