diff --git a/app/Api/V1/Requests/Models/Transaction/StoreRequest.php b/app/Api/V1/Requests/Models/Transaction/StoreRequest.php
index f6c1d2803c..3138ffca0b 100644
--- a/app/Api/V1/Requests/Models/Transaction/StoreRequest.php
+++ b/app/Api/V1/Requests/Models/Transaction/StoreRequest.php
@@ -225,25 +225,25 @@ class StoreRequest extends FormRequest
 
             // other interesting fields
             'transactions.*.reconciled'            => [new IsBoolean()],
-            'transactions.*.notes'                 => 'min:1,max:50000|nullable',
+            'transactions.*.notes'                 => 'min:1|max:50000|nullable',
             'transactions.*.tags'                  => 'between:0,255',
 
             // meta info fields
-            'transactions.*.internal_reference'    => 'min:1,max:255|nullable',
-            'transactions.*.external_id'           => 'min:1,max:255|nullable',
-            'transactions.*.recurrence_id'         => 'min:1,max:255|nullable',
-            'transactions.*.bunq_payment_id'       => 'min:1,max:255|nullable',
-            'transactions.*.external_url'          => 'min:1,max:255|nullable|url',
+            'transactions.*.internal_reference'    => 'min:1|max:255|nullable',
+            'transactions.*.external_id'           => 'min:1|max:255|nullable',
+            'transactions.*.recurrence_id'         => 'min:1|max:255|nullable',
+            'transactions.*.bunq_payment_id'       => 'min:1|max:255|nullable',
+            'transactions.*.external_url'          => 'min:1|max:255|nullable|url',
 
             // SEPA fields:
-            'transactions.*.sepa_cc'               => 'min:1,max:255|nullable',
-            'transactions.*.sepa_ct_op'            => 'min:1,max:255|nullable',
-            'transactions.*.sepa_ct_id'            => 'min:1,max:255|nullable',
-            'transactions.*.sepa_db'               => 'min:1,max:255|nullable',
-            'transactions.*.sepa_country'          => 'min:1,max:255|nullable',
-            'transactions.*.sepa_ep'               => 'min:1,max:255|nullable',
-            'transactions.*.sepa_ci'               => 'min:1,max:255|nullable',
-            'transactions.*.sepa_batch_id'         => 'min:1,max:255|nullable',
+            'transactions.*.sepa_cc'               => 'min:1|max:255|nullable',
+            'transactions.*.sepa_ct_op'            => 'min:1|max:255|nullable',
+            'transactions.*.sepa_ct_id'            => 'min:1|max:255|nullable',
+            'transactions.*.sepa_db'               => 'min:1|max:255|nullable',
+            'transactions.*.sepa_country'          => 'min:1|max:255|nullable',
+            'transactions.*.sepa_ep'               => 'min:1|max:255|nullable',
+            'transactions.*.sepa_ci'               => 'min:1|max:255|nullable',
+            'transactions.*.sepa_batch_id'         => 'min:1|max:255|nullable',
 
             // dates
             'transactions.*.interest_date'         => 'date|nullable',
diff --git a/app/Api/V1/Requests/Models/Transaction/UpdateRequest.php b/app/Api/V1/Requests/Models/Transaction/UpdateRequest.php
index 2fc4dfdf18..bf39777d97 100644
--- a/app/Api/V1/Requests/Models/Transaction/UpdateRequest.php
+++ b/app/Api/V1/Requests/Models/Transaction/UpdateRequest.php
@@ -24,6 +24,7 @@ declare(strict_types=1);
 
 namespace FireflyIII\Api\V1\Requests\Models\Transaction;
 
+use FireflyIII\Exceptions\FireflyException;
 use FireflyIII\Models\TransactionGroup;
 use FireflyIII\Rules\BelongsUser;
 use FireflyIII\Rules\IsBoolean;
@@ -61,6 +62,7 @@ class UpdateRequest extends FormRequest
      */
     public function getAll(): array
     {
+
         Log::debug(sprintf('Now in %s', __METHOD__));
         $this->integerFields = [
             'order',
@@ -163,6 +165,9 @@ class UpdateRequest extends FormRequest
 
         /** @var array $transaction */
         foreach ($this->get('transactions') as $transaction) {
+            if(!is_array($transaction)) {
+                throw new FireflyException('Invalid data submitted: transaction is not array.');
+            }
             // default response is to update nothing in the transaction:
             $current  = [];
             $current  = $this->getIntegerData($current, $transaction);
@@ -359,25 +364,25 @@ class UpdateRequest extends FormRequest
 
             // other interesting fields
             'transactions.*.reconciled'             => [new IsBoolean()],
-            'transactions.*.notes'                  => 'min:1,max:50000|nullable',
+            'transactions.*.notes'                  => 'min:1|max:50000|nullable',
             'transactions.*.tags'                   => 'between:0,255',
 
             // meta info fields
-            'transactions.*.internal_reference'     => 'min:1,max:255|nullable',
-            'transactions.*.external_id'            => 'min:1,max:255|nullable',
-            'transactions.*.recurrence_id'          => 'min:1,max:255|nullable',
-            'transactions.*.bunq_payment_id'        => 'min:1,max:255|nullable',
-            'transactions.*.external_url'           => 'min:1,max:255|nullable|url',
+            'transactions.*.internal_reference'     => 'min:1|max:255|nullable',
+            'transactions.*.external_id'            => 'min:1|max:255|nullable',
+            'transactions.*.recurrence_id'          => 'min:1|max:255|nullable',
+            'transactions.*.bunq_payment_id'        => 'min:1|max:255|nullable',
+            'transactions.*.external_url'           => 'min:1|max:255|nullable|url',
 
             // SEPA fields:
-            'transactions.*.sepa_cc'                => 'min:1,max:255|nullable',
-            'transactions.*.sepa_ct_op'             => 'min:1,max:255|nullable',
-            'transactions.*.sepa_ct_id'             => 'min:1,max:255|nullable',
-            'transactions.*.sepa_db'                => 'min:1,max:255|nullable',
-            'transactions.*.sepa_country'           => 'min:1,max:255|nullable',
-            'transactions.*.sepa_ep'                => 'min:1,max:255|nullable',
-            'transactions.*.sepa_ci'                => 'min:1,max:255|nullable',
-            'transactions.*.sepa_batch_id'          => 'min:1,max:255|nullable',
+            'transactions.*.sepa_cc'                => 'min:1|max:255|nullable',
+            'transactions.*.sepa_ct_op'             => 'min:1|max:255|nullable',
+            'transactions.*.sepa_ct_id'             => 'min:1|max:255|nullable',
+            'transactions.*.sepa_db'                => 'min:1|max:255|nullable',
+            'transactions.*.sepa_country'           => 'min:1|max:255|nullable',
+            'transactions.*.sepa_ep'                => 'min:1|max:255|nullable',
+            'transactions.*.sepa_ci'                => 'min:1|max:255|nullable',
+            'transactions.*.sepa_batch_id'          => 'min:1|max:255|nullable',
 
             // dates
             'transactions.*.interest_date'          => 'date|nullable',
@@ -398,6 +403,7 @@ class UpdateRequest extends FormRequest
      */
     public function withValidator(Validator $validator): void
     {
+        Log::debug('Now in withValidator');
         /** @var TransactionGroup $transactionGroup */
         $transactionGroup = $this->route()->parameter('transactionGroup');
         $validator->after(
diff --git a/app/Http/Requests/MassEditJournalRequest.php b/app/Http/Requests/MassEditJournalRequest.php
index d7759af6a1..0ac30468b3 100644
--- a/app/Http/Requests/MassEditJournalRequest.php
+++ b/app/Http/Requests/MassEditJournalRequest.php
@@ -45,7 +45,7 @@ class MassEditJournalRequest extends FormRequest
         // fixed
 
         return [
-            'description.*'    => 'required|min:1,max:255',
+            'description.*'    => 'required|min:1|max:255',
             'source_id.*'      => 'numeric|belongsToUser:accounts,id',
             'destination_id.*' => 'numeric|belongsToUser:accounts,id',
             'journals.*'       => 'numeric|belongsToUser:transaction_journals,id',
diff --git a/app/Validation/GroupValidation.php b/app/Validation/GroupValidation.php
index b713fd8150..78d18a55aa 100644
--- a/app/Validation/GroupValidation.php
+++ b/app/Validation/GroupValidation.php
@@ -24,6 +24,7 @@ declare(strict_types=1);
 
 namespace FireflyIII\Validation;
 
+use FireflyIII\Exceptions\FireflyException;
 use FireflyIII\Models\TransactionGroup;
 use Illuminate\Validation\Validator;
 use Illuminate\Support\Facades\Log;
@@ -53,6 +54,9 @@ trait GroupValidation
         ];
         /** @var array $transaction */
         foreach ($transactions as $index => $transaction) {
+            if(!is_array($transaction)) {
+                throw new FireflyException('Invalid data submitted: transaction is not array.');
+            }
             $hasAccountInfo = false;
             $hasJournalId   = array_key_exists('transaction_journal_id', $transaction);
             foreach ($keys as $key) {
diff --git a/app/Validation/TransactionValidation.php b/app/Validation/TransactionValidation.php
index 201fed88ee..e246a6171c 100644
--- a/app/Validation/TransactionValidation.php
+++ b/app/Validation/TransactionValidation.php
@@ -23,6 +23,7 @@ declare(strict_types=1);
 
 namespace FireflyIII\Validation;
 
+use FireflyIII\Exceptions\FireflyException;
 use FireflyIII\Models\Account;
 use FireflyIII\Models\AccountType;
 use FireflyIII\Models\Transaction;
@@ -358,6 +359,9 @@ trait TransactionValidation
          * @var array $transaction
          */
         foreach ($transactions as $index => $transaction) {
+            if(!is_int($index)) {
+                throw new FireflyException('Invalid data submitted: transaction is not array.');
+            }
             $this->validateSingleUpdate($validator, $index, $transaction, $transactionGroup);
         }
     }
diff --git a/resources/lang/en_US/validation.php b/resources/lang/en_US/validation.php
index d90ab1969b..d2b91ef4a4 100644
--- a/resources/lang/en_US/validation.php
+++ b/resources/lang/en_US/validation.php
@@ -231,8 +231,8 @@ return [
     'generic_invalid_source'      => 'You can\'t use this account as the source account.',
     'generic_invalid_destination' => 'You can\'t use this account as the destination account.',
 
-    'generic_no_source'      => 'You must submit source account information.',
-    'generic_no_destination' => 'You must submit destination account information.',
+    'generic_no_source'      => 'You must submit source account information or submit a transaction journal ID.',
+    'generic_no_destination' => 'You must submit destination account information or submit a transaction journal ID.',
 
     'gte.numeric' => 'The :attribute must be greater than or equal to :value.',
     'gt.numeric'  => 'The :attribute must be greater than :value.',