diff --git a/core/types/hammer_test.go b/core/types/hammer_test.go
index 44a146fb..857697ee 100644
--- a/core/types/hammer_test.go
+++ b/core/types/hammer_test.go
@@ -235,7 +235,7 @@ func TestHammerEmptyScenarioItemID(t *testing.T) {
 		},
 	}
 	if err := h.Validate(); err == nil {
-		t.Errorf("TestHammerInvalidScenarioItemID errored")
+		t.Errorf("1- TestHammerEmptyScenarioItemID should be errored")
 	}
 
 	// Multi Scenario
@@ -254,7 +254,34 @@ func TestHammerEmptyScenarioItemID(t *testing.T) {
 		},
 	}
 	if err := h.Validate(); err == nil {
-		t.Errorf("TestHammerInvalidScenarioItemID errored")
+		t.Errorf("2- TestHammerEmptyScenarioItemID should be errored")
+	}
+}
+
+func TestHammerDuplicateScenarioItemID(t *testing.T) {
+	// Single Scenario
+	h := newDummyHammer()
+	h.Scenario = Scenario{
+		Scenario: []ScenarioItem{
+			{
+				ID:       1,
+				Protocol: SupportedProtocols[0],
+				Method:   supportedProtocolMethods["HTTP"][1],
+			},
+			{
+				ID:       2,
+				Protocol: SupportedProtocols[0],
+				Method:   supportedProtocolMethods["HTTP"][1],
+			},
+			{
+				ID:       2,
+				Protocol: SupportedProtocols[0],
+				Method:   supportedProtocolMethods["HTTP"][1],
+			},
+		},
+	}
+	if err := h.Validate(); err == nil {
+		t.Errorf("TestHammerDuplicateScenarioItemID should be errored")
 	}
 }
 
diff --git a/core/types/scenario.go b/core/types/scenario.go
index 08c35e1b..875511be 100644
--- a/core/types/scenario.go
+++ b/core/types/scenario.go
@@ -69,10 +69,16 @@ type Scenario struct {
 }
 
 func (s *Scenario) validate() error {
+	stepIds := make(map[int16]struct{}, len(s.Scenario))
 	for _, si := range s.Scenario {
 		if err := si.validate(); err != nil {
 			return err
 		}
+
+		if _, ok := stepIds[si.ID]; ok {
+			return fmt.Errorf("duplicate step id: %d", si.ID)
+		}
+		stepIds[si.ID] = struct{}{}
 	}
 	return nil
 }
@@ -132,7 +138,7 @@ func (si *ScenarioItem) validate() error {
 		return fmt.Errorf("unsupported Authentication Method (%s) For Protocol (%s) ", si.Auth.Type, si.Protocol)
 	}
 	if si.ID == 0 {
-		return fmt.Errorf("each scenario item should have an unique ID")
+		return fmt.Errorf("step ID should be greater than zero")
 	}
 	if si.Sleep != "" {
 		sleep := strings.Split(si.Sleep, "-")