diff --git a/Source/Engine/Visject/ShaderGraph.cpp b/Source/Engine/Visject/ShaderGraph.cpp
index 688e46382..faf344263 100644
--- a/Source/Engine/Visject/ShaderGraph.cpp
+++ b/Source/Engine/Visject/ShaderGraph.cpp
@@ -146,6 +146,8 @@ void ShaderGenerator::ProcessGroupMath(Box* box, Node* node, Value& value)
         Box* b2 = node->GetBox(1);
         Value v1 = tryGetValue(b1, 0, Value::Zero);
         Value v2 = tryGetValue(b2, 1, Value::Zero);
+        if (SanitizeMathValue(v1, node, b1, &value))
+            break;
         if (b1->HasConnection())
             v2 = v2.Cast(v1.Type);
         else
@@ -251,7 +253,10 @@ void ShaderGenerator::ProcessGroupMath(Box* box, Node* node, Value& value)
     // Lerp
     case 25:
     {
-        Value a = tryGetValue(node->GetBox(0), 0, Value::Zero);
+        auto boxA = node->GetBox(0);
+        Value a = tryGetValue(boxA, 0, Value::Zero);
+        if (SanitizeMathValue(a, node, boxA, &value))
+            break;
         Value b = tryGetValue(node->GetBox(1), 1, Value::One).Cast(a.Type);
         Value alpha = tryGetValue(node->GetBox(2), 2, Value::Zero).Cast(ValueType::Float);
         String text = String::Format(TEXT("lerp({0}, {1}, {2})"), a.Value, b.Value, alpha.Value);
@@ -1364,6 +1369,20 @@ SerializedMaterialParam& ShaderGenerator::findOrAddGlobalSDF()
     return param;
 }
 
+bool ShaderGenerator::SanitizeMathValue(Value& value, Node* node, Box* box, Value* resultOnInvalid)
+{
+    bool invalid = value.Type == VariantType::Object;
+    if (invalid)
+    {
+        OnError(node, box, TEXT("Invalid input type for math operation"));
+        if (resultOnInvalid)
+            *resultOnInvalid = Value::Zero;
+        else
+            value = Value::Zero;
+    }
+    return invalid;
+}
+
 String ShaderGenerator::getLocalName(int32 index)
 {
     return TEXT("local") + StringUtils::ToString(index);
diff --git a/Source/Engine/Visject/ShaderGraph.h b/Source/Engine/Visject/ShaderGraph.h
index ab0e7d405..5b17604d0 100644
--- a/Source/Engine/Visject/ShaderGraph.h
+++ b/Source/Engine/Visject/ShaderGraph.h
@@ -255,6 +255,8 @@ protected:
     SerializedMaterialParam& findOrAddTextureGroupSampler(int32 index);
     SerializedMaterialParam& findOrAddGlobalSDF();
 
+    bool SanitizeMathValue(Value& value, Node* node, Box* box, Value* resultOnInvalid = nullptr);
+
     static String getLocalName(int32 index);
     static String getParamName(int32 index);
 };