From 9ecb0b275e3abe319c6f69c9c9669ca12d177891 Mon Sep 17 00:00:00 2001
From: Blottiere Paul <blottiere.paul@gmail.com>
Date: Mon, 30 Apr 2018 10:24:53 +0100
Subject: [PATCH] Fixes crash when deleting last field from attribute table

---
 src/gui/qgsattributeform.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gui/qgsattributeform.cpp b/src/gui/qgsattributeform.cpp
index 8532bcd48de8..3f4fefbf20d7 100644
--- a/src/gui/qgsattributeform.cpp
+++ b/src/gui/qgsattributeform.cpp
@@ -2011,6 +2011,9 @@ void QgsAttributeForm::ContainerInformation::apply( QgsExpressionContext *expres
 
 void QgsAttributeForm::updateJoinedFields( const QgsEditorWidgetWrapper &eww )
 {
+  if ( !eww.layer()->fields().exists( eww.fieldIdx() ) )
+    return;
+
   QgsFeature formFeature;
   QgsField field = eww.layer()->fields().field( eww.fieldIdx() );
   QList<const QgsVectorLayerJoinInfo *> infos = eww.layer()->joinBuffer()->joinsWhereFieldIsId( field );