diff --git a/ml_usql.cpp b/ml_usql.cpp
index 09e750a..03f43c6 100644
--- a/ml_usql.cpp
+++ b/ml_usql.cpp
@@ -21,7 +21,9 @@ MlValue uSQL::ivaluize(const usql::Table *table) {
 		for (int i = 0; i < table->columns_count(); i++) {
 			auto & c = row[i];
 			auto type = table->m_col_defs[i].type;
-			if (type == ColumnType::integer_type || type == ColumnType::date_type) {
+			if (c.isNull()) {
+				columns.push_back(MlValue::nil());
+			} else if (type == ColumnType::integer_type || type == ColumnType::date_type) {
 				columns.push_back(MlValue(c.getIntValue()));
 			} else if (type == ColumnType::bool_type) {
 				columns.push_back(c.getBoolValue() ? MlValue(c.getIntValue()) : MlValue::nil());