From 9b57725b8ca33ade41c10adfc214ed4ea4a6ddf2 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Fri, 1 Feb 2019 11:17:23 +0300
Subject: [PATCH] Fix bad function call in data export cancel.

---
 .../SourceFiles/export/view/export_view_panel_controller.cpp  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Telegram/SourceFiles/export/view/export_view_panel_controller.cpp b/Telegram/SourceFiles/export/view/export_view_panel_controller.cpp
index 736ef843e..ab778ebe0 100644
--- a/Telegram/SourceFiles/export/view/export_view_panel_controller.cpp
+++ b/Telegram/SourceFiles/export/view/export_view_panel_controller.cpp
@@ -301,7 +301,9 @@ void PanelController::stopWithConfirmation(FnMut<void()> callback) {
 	if (!_state.is<ProcessingState>()) {
 		LOG(("Export Info: Stop Panel Without Confirmation."));
 		stopExport();
-		callback();
+		if (callback) {
+			callback();
+		}
 		return;
 	}
 	auto stop = [=, callback = std::move(callback)]() mutable {