diff --git a/public/app/features/alerting/unified/hooks/useCombinedRuleNamespaces.ts b/public/app/features/alerting/unified/hooks/useCombinedRuleNamespaces.ts
index eb9f5f73801..7297e8a83fa 100644
--- a/public/app/features/alerting/unified/hooks/useCombinedRuleNamespaces.ts
+++ b/public/app/features/alerting/unified/hooks/useCombinedRuleNamespaces.ts
@@ -275,11 +275,11 @@ export function calculateRuleTotals(rule: Pick<AlertingRule, 'alerts' | 'totals'
   }
 
   return {
-    alerting: result[AlertInstanceTotalState.Alerting],
+    alerting: result[AlertInstanceTotalState.Alerting] || result['firing'],
     pending: result[AlertInstanceTotalState.Pending],
     inactive: result[AlertInstanceTotalState.Normal],
     nodata: result[AlertInstanceTotalState.NoData],
-    error: result[AlertInstanceTotalState.Error] + result['err'], // Prometheus uses "err" instead of "error"
+    error: result[AlertInstanceTotalState.Error] || result['err'] || undefined, // Prometheus uses "err" instead of "error"
   };
 }