diff --git a/kraken-java-sdk/kraken-java-sdk-gateway/src/main/java/com/consoleconnect/kraken/operator/gateway/runner/DataTypeChecker.java b/kraken-java-sdk/kraken-java-sdk-gateway/src/main/java/com/consoleconnect/kraken/operator/gateway/runner/DataTypeChecker.java
index bd6bbeed..0025a63e 100644
--- a/kraken-java-sdk/kraken-java-sdk-gateway/src/main/java/com/consoleconnect/kraken/operator/gateway/runner/DataTypeChecker.java
+++ b/kraken-java-sdk/kraken-java-sdk-gateway/src/main/java/com/consoleconnect/kraken/operator/gateway/runner/DataTypeChecker.java
@@ -70,6 +70,15 @@ default boolean checkExpectString(PathCheck pathCheck, Object variable) {
               variable,
               (dataType == null ? null : dataType.getSimpleName()),
               "String"));
+    } else if (StringUtils.isBlank((String) variable)) {
+      throwException(
+          pathCheck,
+          String.format(
+              EXPECT_INT_MSG,
+              extractCheckingPath(pathCheck.path()),
+              variable,
+              "empty string",
+              "Non Empty String"));
     }
     return true;
   }