diff --git a/js/component/card/runtime_detail.js b/js/component/card/runtime_detail.js
index 822d310..b81a578 100644
--- a/js/component/card/runtime_detail.js
+++ b/js/component/card/runtime_detail.js
@@ -72,11 +72,18 @@ beestat.component.card.runtime_detail.prototype.decorate_contents_ = function(pa
     );
   }
 
+  // Don't go before there's data.
   required_begin = moment.max(
     required_begin,
     moment(thermostat.first_connected)
   );
 
+  // Don't go after now.
+  required_end = moment.min(
+    required_end,
+    moment().subtract(1, 'hour')
+  );
+
   /**
    * If the needed data exists in the database and the runtime_thermostat
    * cache is empty, then query the data. If the needed data does not exist in