From 119b17ac75030420793ac3c0f2a9fd090e989e78 Mon Sep 17 00:00:00 2001
From: EvilSpirit <anandamide@mail.ru>
Date: Fri, 20 Jan 2017 10:12:45 +0700
Subject: [PATCH] Fix an occasional crash when starting to drag an entity.

---
 src/mouse.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/mouse.cpp b/src/mouse.cpp
index 1b6c3f08..41edcea9 100644
--- a/src/mouse.cpp
+++ b/src/mouse.cpp
@@ -72,7 +72,12 @@ void GraphicsWindow::StartDraggingBySelection() {
     // The user might select a point, and then click it again to start
     // dragging; but the point just got unselected by that click. So drag
     // the hovered item too, and they'll always have it.
-    if(hover.entity.v) StartDraggingByEntity(ChooseFromHoverToDrag().entity);
+    if(hover.entity.v) {
+        hEntity dragEntity = ChooseFromHoverToDrag().entity;
+        if(dragEntity.v != Entity::NO_ENTITY.v) {
+            StartDraggingByEntity(dragEntity);
+        }
+    }
 }
 
 void GraphicsWindow::MouseMoved(double x, double y, bool leftDown,