Fixed a SQL error that could occur when using :empty: or `:notempty…

…:` on a relational field.
craftcms · Jul 16, 2019 · 535d083 · 535d083
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diff --git a/CHANGELOG-v3.md b/CHANGELOG-v3.md
@@ -5,6 +5,7 @@
 ### Fixed
 - Fixed a JavaScript error that could occur after uploading a file directly onto an Assets field when editing the Current revision of an entry.
 - Fixed a bug where draft forms could become unresponsive if the user attempted to navigate away from the page or submit the form in the middle of an autosave. ([#4578](https://github.com/craftcms/cms/issues/4578))
+- Fixed a SQL error that could occur when using `:empty:` or `:notempty:` on a relational field. ([#4529](https://github.com/craftcms/cms/issues/4529))
 
 ## 3.2.3 - 2019-07-16
 

diff --git a/src/elements/db/ElementQuery.php b/src/elements/db/ElementQuery.php
@@ -2542,7 +2542,7 @@ private function _applyUniqueParam(Connection $db)
         $subSelectSql = str_replace($qTmpElements, $qElements, $subSelectSql);
         $subSelectSql = str_replace("{$qSubElements} {$qSubElements}", "{$qElements} {$qSubElements}", $subSelectSql);
 
-        $this->subQuery->where(new Expression("[[elements_sites.id]] = ({$subSelectSql})"));
+        $this->subQuery->andWhere(new Expression("[[elements_sites.id]] = ({$subSelectSql})"));
     }
 
     /**