diff --git a/app/Generator/Chart/Bill/ChartJsBillChartGenerator.php b/app/Generator/Chart/Bill/ChartJsBillChartGenerator.php
index f81362c1b4..f756dadcce 100644
--- a/app/Generator/Chart/Bill/ChartJsBillChartGenerator.php
+++ b/app/Generator/Chart/Bill/ChartJsBillChartGenerator.php
@@ -75,7 +75,8 @@ class ChartJsBillChartGenerator implements BillChartGeneratorInterface
             /*
              * journalAmount has been collected in BillRepository::getJournals
              */
-            $actualAmount[] = round(bcmul($entry->journalAmount, '-1'), 2);
+            $journalAmount  = $entry->journalAmount ?? '0';
+            $actualAmount[] = round(bcmul($journalAmount, '-1'), 2);
         }
 
         $data['datasets'][] = [