diff --git a/.eslintrc.js b/.eslintrc.js
index f6c62be..96eeef8 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -16,6 +16,7 @@ module.exports = {
   },
   ignorePatterns: ['.eslintrc.js'],
   rules: {
+    '@typescript-eslint/no-floating-promises': 'error',
     '@typescript-eslint/interface-name-prefix': 'off',
     '@typescript-eslint/explicit-function-return-type': 'off',
     '@typescript-eslint/explicit-module-boundary-types': 'off',
diff --git a/src/main.ts b/src/main.ts
index a0b44e3..0a7a6f1 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -6,4 +6,4 @@ async function bootstrap() {
   const app = await NestFactory.create<NestExpressApplication>(AppModule);
   await app.listen(3000);
 }
-bootstrap();
+void bootstrap();
diff --git a/src/transaction/transaction.controller.ts b/src/transaction/transaction.controller.ts
index b6af91b..0c50631 100644
--- a/src/transaction/transaction.controller.ts
+++ b/src/transaction/transaction.controller.ts
@@ -117,17 +117,22 @@ export class TransactionController {
 
     try {
       this.exchangeRateService.convertCurrency(exhangeRateInput).subscribe({
-        next: async (exchangeRateResponse) => {
-          this.transactionService.insertOne({
-            date: transactionInput.date,
-            amount: parseInt(transactionInput.amount),
-            currency: transactionInput.currency,
-            client_id: transactionInput.client_id,
-            commission: await commissionAmount,
-            base_currency: Currency.EUR,
-            base_amount: parseInt(transactionInput.amount) * exchangeRateResponse[transactionInput.currency],
-          });
-        },
+        next: (exchangeRateResponse) =>
+          commissionAmount
+            .then((commission) =>
+              this.transactionService.insertOne({
+                date: transactionInput.date,
+                amount: parseInt(transactionInput.amount),
+                currency: transactionInput.currency,
+                client_id: transactionInput.client_id,
+                commission,
+                base_currency: Currency.EUR,
+                base_amount:
+                  parseInt(transactionInput.amount) *
+                  exchangeRateResponse[transactionInput.currency],
+              }),
+            )
+            .catch((error) => console.log(error)),
         error: (error) => {
           console.log(error);
         },
@@ -145,15 +150,17 @@ export class TransactionController {
       transactionInput,
     );
     try {
-      this.transactionService.insertOne({
-        date: transactionInput.date,
-        amount: parseInt(transactionInput.amount),
-        currency: transactionInput.currency,
-        client_id: transactionInput.client_id,
-        commission: commissionAmount,
-        base_currency: Currency.EUR,
-        base_amount: parseInt(transactionInput.amount),
-      });
+      this.transactionService
+        .insertOne({
+          date: transactionInput.date,
+          amount: parseInt(transactionInput.amount),
+          currency: transactionInput.currency,
+          client_id: transactionInput.client_id,
+          commission: commissionAmount,
+          base_currency: Currency.EUR,
+          base_amount: parseInt(transactionInput.amount),
+        })
+        .catch((error) => console.log(error));
     } catch (error) {
       console.log(error);
       throw error;