diff --git a/client/src/main/java/info/frostfs/sdk/utils/Validator.java b/client/src/main/java/info/frostfs/sdk/utils/Validator.java
index f8e2120..212debd 100644
--- a/client/src/main/java/info/frostfs/sdk/utils/Validator.java
+++ b/client/src/main/java/info/frostfs/sdk/utils/Validator.java
@@ -16,10 +16,11 @@ import static java.util.Objects.isNull;
 
 public class Validator {
     public static <T> void validate(T object) {
-        StringBuilder errorMessage = new StringBuilder().append(System.lineSeparator());
+        StringBuilder errorMessage = new StringBuilder();
         process(object, errorMessage);
 
         if (errorMessage.length() != 0) {
+            errorMessage.insert(0, System.lineSeparator());
             throw new ValidationFrostFSException(errorMessage.toString());
         }
     }