From 663d7d0a12f0c312ba7d042a12a7b607c131bad0 Mon Sep 17 00:00:00 2001
From: ACMCMC <20495460+ACMCMC@users.noreply.github.com>
Date: Tue, 23 Nov 2021 09:51:17 +0100
Subject: [PATCH] Solved missing `invert` attribute bug

---
 wagtail/search/backends/database/mysql/query.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/wagtail/search/backends/database/mysql/query.py b/wagtail/search/backends/database/mysql/query.py
index 888ca8368c..4fb370f9fe 100644
--- a/wagtail/search/backends/database/mysql/query.py
+++ b/wagtail/search/backends/database/mysql/query.py
@@ -11,6 +11,7 @@ from django.db.models.sql.compiler import SQLCompiler
 class LexemeCombinable(Expression):
     BITAND = '+'
     BITOR = ''
+    invert = False  # By default, it is not inverted
 
     def _combine(self, other, connector, reversed, node=None):
         if not isinstance(other, LexemeCombinable):