diff --git a/app/Repositories/PiggyBank/ModifiesPiggyBanks.php b/app/Repositories/PiggyBank/ModifiesPiggyBanks.php
index 7fa1c4c42d..df3e98c10e 100644
--- a/app/Repositories/PiggyBank/ModifiesPiggyBanks.php
+++ b/app/Repositories/PiggyBank/ModifiesPiggyBanks.php
@@ -377,11 +377,11 @@ trait ModifiesPiggyBanks
         }
         if (array_key_exists('targetdate', $data) && '' !== $data['targetdate']) {
             $piggyBank->targetdate    = $data['targetdate'];
-            $piggyBank->targetdate_tz = $data['targetdate']->format('e');
+            $piggyBank->targetdate_tz = $data['targetdate']?->format('e');
         }
         if (array_key_exists('startdate', $data)) {
             $piggyBank->startdate    = $data['startdate'];
-            $piggyBank->startdate_tz = $data['targetdate']->format('e');
+            $piggyBank->startdate_tz = $data['targetdate']?->format('e');
         }
         $piggyBank->save();
 
diff --git a/app/Support/Models/AccountBalanceCalculator.php b/app/Support/Models/AccountBalanceCalculator.php
index cd0e0860c7..94908ed2b3 100644
--- a/app/Support/Models/AccountBalanceCalculator.php
+++ b/app/Support/Models/AccountBalanceCalculator.php
@@ -236,12 +236,12 @@ class AccountBalanceCalculator
                         'balance'                 => '0',
                         'transaction_currency_id' => $currencyId,
                         'date'                    => $balance[1],
-                        'date_tz'                 => $balance[1]->format('e'),
+                        'date_tz'                 => $balance[1]?->format('e'),
                     ]
                 );
                 $object->balance = $balance[0];
                 $object->date    = $balance[1];
-                $object->date_tz = $balance[1]->format('e');
+                $object->date_tz = $balance[1]?->format('e');
                 $object->save();
             }
         }