diff --git a/usql/usql.cpp b/usql/usql.cpp
index 3835007..ca18fe1 100644
--- a/usql/usql.cpp
+++ b/usql/usql.cpp
@@ -173,10 +173,8 @@ std::unique_ptr<ValueNode> USql::eval_function_value_node(Table *table, Row &row
 		evaluatedPars.push_back(eval_value_node(table, row, param.get(), nullptr, nullptr));
 	}
 
-	// at this moment no functions without parameter(s) or first param can be null
 	if (evaluatedPars.empty() || evaluatedPars[0]->isNull())
-		throw Exception("eval_function_value_node, no function parameter or first is null, function: " + fnc->function);
-		// return std::make_unique<NullValueNode>();
+		return std::make_unique<NullValueNode>();
 
 	// TODO use some enum
 	if (fnc->function == "lower") return lower_function(evaluatedPars);