diff --git a/library/Icingadb/ProvidedHook/Reporting/SlaReport.php b/library/Icingadb/ProvidedHook/Reporting/SlaReport.php
index b5898fd83..b9815eb7a 100644
--- a/library/Icingadb/ProvidedHook/Reporting/SlaReport.php
+++ b/library/Icingadb/ProvidedHook/Reporting/SlaReport.php
@@ -112,6 +112,10 @@ protected function fetchReportData(Timerange $timerange, array $config = null)
             }
         } else {
             foreach ($this->fetchSla($timerange, $filter) as $row) {
+                if ($row->sla === null) {
+                    $row->sla = 0.0;
+                }
+
                 $rows[] = $this->createReportRow($row);
             }
         }