diff --git a/lib/serializer.js b/lib/serializer.js
index <HASH>..<HASH> 100644
--- a/lib/serializer.js
+++ b/lib/serializer.js
@@ -632,6 +632,10 @@ class Serializer {
     }
     if (val.isRaw)
       return this._serializeRaw(val, inf);
+    if (val.type === 'select') {
+      const s = this._serializeSelect(val);
+      return s ? '(' + s + ')' : 'null';
+    }
     if (typeof val === 'string')
       return this._serializeStringValue(val, inf);
     if (isNumeric(val))
Fix serializing "select" in condition value

this closes #<I>