From cbad71c2cdcc7eae49bbb868bb2cdb88194123ac Mon Sep 17 00:00:00 2001
From: signedav <david@opengis.ch>
Date: Thu, 20 Aug 2020 10:32:38 +0200
Subject: [PATCH] clear expression on empty value and set expression when there
 is a value. this fixes #37843

---
 .../editorwidgets/qgsrelationreferencesearchwidgetwrapper.cpp   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gui/editorwidgets/qgsrelationreferencesearchwidgetwrapper.cpp b/src/gui/editorwidgets/qgsrelationreferencesearchwidgetwrapper.cpp
index 38a755e6417..69c3d28dc50 100644
--- a/src/gui/editorwidgets/qgsrelationreferencesearchwidgetwrapper.cpp
+++ b/src/gui/editorwidgets/qgsrelationreferencesearchwidgetwrapper.cpp
@@ -143,7 +143,7 @@ void QgsRelationReferenceSearchWidgetWrapper::onValueChanged( const QVariant &va
 
 void QgsRelationReferenceSearchWidgetWrapper::onValuesChanged( const QVariantList &values )
 {
-  if ( !values.isEmpty() )
+  if ( values.isEmpty() )
   {
     clearExpression();
     emit valueCleared();