diff --git a/dbms/src/main/java/org/polypheny/db/transaction/TransactionImpl.java b/dbms/src/main/java/org/polypheny/db/transaction/TransactionImpl.java
index dab111dce8..008a7db787 100644
--- a/dbms/src/main/java/org/polypheny/db/transaction/TransactionImpl.java
+++ b/dbms/src/main/java/org/polypheny/db/transaction/TransactionImpl.java
@@ -202,6 +202,7 @@ public void commit() throws TransactionException {
 
         Pair<Boolean, String> isValid = checkIntegrity();
         if ( !isValid.left ) {
+            rollback( "Constraint violation" );
             throw new TransactionException( isValid.right + "\nThere are violated constraints, the transaction was rolled back!" );
         }