From 099df0bf3dc9ebd9f26370784bd5cfa65b090985 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Fri, 11 Oct 2019 20:06:28 +0200
Subject: [PATCH] addVectorLayerPrivate(): avoid crash in the non-nominal case
 when added a layer for a non-existing provider

---
 src/app/qgisapp.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/app/qgisapp.cpp b/src/app/qgisapp.cpp
index 4b2e3fe4059..886dd39d648 100644
--- a/src/app/qgisapp.cpp
+++ b/src/app/qgisapp.cpp
@@ -11395,7 +11395,7 @@ QgsVectorLayer *QgisApp::addVectorLayerPrivate( const QString &vectorLayerPath,
   {
     if ( guiWarning )
     {
-      QString message = layer->dataProvider()->error().message( QgsErrorMessage::Text );
+      QString message = layer->dataProvider() ? layer->dataProvider()->error().message( QgsErrorMessage::Text ) : tr( "Invalid provider" );
       QString msg = tr( "The layer %1 is not a valid layer and can not be added to the map. Reason: %2" ).arg( vectorLayerPath, message );
       visibleMessageBar()->pushMessage( tr( "Layer is not valid" ), msg, Qgis::Critical, messageTimeout() );
     }