diff --git a/app/Console/Commands/UpgradeDatabase.php b/app/Console/Commands/UpgradeDatabase.php
index ee66cebb58..15f17eba73 100644
--- a/app/Console/Commands/UpgradeDatabase.php
+++ b/app/Console/Commands/UpgradeDatabase.php
@@ -220,7 +220,7 @@ class UpgradeDatabase extends Command
 
                         // when mismatch in transaction:
                         if (!(intval($transaction->transaction_currency_id) === intval($currency->id))) {
-                            $transaction->foreign_currency_id     = $transaction->transaction_currency_id;
+                            $transaction->foreign_currency_id     = intval($transaction->transaction_currency_id);
                             $transaction->foreign_amount          = $transaction->amount;
                             $transaction->transaction_currency_id = $currency->id;
                             $transaction->save();
diff --git a/app/Http/Controllers/TransactionController.php b/app/Http/Controllers/TransactionController.php
index b271a9f4ad..ba24a58696 100644
--- a/app/Http/Controllers/TransactionController.php
+++ b/app/Http/Controllers/TransactionController.php
@@ -272,7 +272,7 @@ class TransactionController extends Controller
         $return = [];
         /** @var Transaction $transaction */
         foreach ($collection as $transaction) {
-            $currencyId = $transaction->transaction_currency_id;
+            $currencyId = intval($transaction->transaction_currency_id);
 
             // save currency information:
             if (!isset($return[$currencyId])) {
diff --git a/app/Import/Storage/ImportSupport.php b/app/Import/Storage/ImportSupport.php
index 3acf03b550..177831e4ba 100644
--- a/app/Import/Storage/ImportSupport.php
+++ b/app/Import/Storage/ImportSupport.php
@@ -121,10 +121,10 @@ trait ImportSupport
     {
         $transaction                          = new Transaction;
         $transaction->account_id              = $parameters['account'];
-        $transaction->transaction_journal_id  = $parameters['id'];
-        $transaction->transaction_currency_id = $parameters['currency'];
+        $transaction->transaction_journal_id  = intval($parameters['id']);
+        $transaction->transaction_currency_id = intval($parameters['currency']);
         $transaction->amount                  = $parameters['amount'];
-        $transaction->foreign_currency_id     = $parameters['foreign_currency'];
+        $transaction->foreign_currency_id     = intval($parameters['foreign_currency']);
         $transaction->foreign_amount          = $parameters['foreign_amount'];
         $transaction->save();
         if (null === $transaction->id) {
diff --git a/app/Support/Steam.php b/app/Support/Steam.php
index 989801716a..c0f5f291f0 100644
--- a/app/Support/Steam.php
+++ b/app/Support/Steam.php
@@ -184,11 +184,11 @@ class Steam
             $modified        = null === $entry->modified ? '0' : strval($entry->modified);
             $foreignModified = null === $entry->modified_foreign ? '0' : strval($entry->modified_foreign);
             $amount          = '0';
-            if ($currencyId === $entry->transaction_currency_id || 0 === $currencyId) {
+            if ($currencyId === intval($entry->transaction_currency_id) || 0 === $currencyId) {
                 // use normal amount:
                 $amount = $modified;
             }
-            if ($currencyId === $entry->foreign_currency_id) {
+            if ($currencyId === intval($entry->foreign_currency_id)) {
                 // use foreign amount:
                 $amount = $foreignModified;
             }