diff --git a/index.js b/index.js
index 3df5ef6..eaab49d 100644
--- a/index.js
+++ b/index.js
@@ -475,9 +475,18 @@ class ClickHouse {
 		}).join('\t');
 	}
 	
+	_convertTypes(value) {
+		if (value===true) {
+			return '1'
+		}
+		if (value===false) {
+			return '0'
+		}
+		return value != null ? value : ''
+	}
 	
 	_mapRowAsObject(fieldList, row) {
-		return fieldList.map(f => encodeValue(false, row[f] || '', 'TabSeparated')).join('\t');
+		return fieldList.map(f => encodeValue(false, this._convertTypes(row[f]), 'TabSeparated')).join('\t');
 	}