fixed crash when a project is reloaded during rendering.
fixed crash when a project is reloaded during rendering.

Aakash1312/appleseed,Vertexwahn/appleseed,est77/appleseed,dictoon/appleseed,glebmish/appleseed,Aakash1312/appleseed,Biart95/appleseed,Aakash1312/appleseed,Vertexwahn/appleseed,docwhite/appleseed,Biart95/appleseed,appleseedhq/appleseed,pjessesco/appleseed,aytekaman/appleseed,appleseedhq/appleseed,luisbarrancos/appleseed,glebmish/appleseed,pjessesco/appleseed,Vertexwahn/appleseed,luisbarrancos/appleseed,appleseedhq/appleseed,docwhite/appleseed,aiivashchenko/appleseed,glebmish/appleseed,docwhite/appleseed,luisbarrancos/appleseed,est77/appleseed,pjessesco/appleseed,aytekaman/appleseed,appleseedhq/appleseed,luisbarrancos/appleseed,Biart95/appleseed,glebmish/appleseed,docwhite/appleseed,dictoon/appleseed,aytekaman/appleseed,est77/appleseed,Aakash1312/appleseed,Aakash1312/appleseed,luisbarrancos/appleseed,Biart95/appleseed,docwhite/appleseed,pjessesco/appleseed,Biart95/appleseed,aytekaman/appleseed,Vertexwahn/appleseed,glebmish/appleseed,gospodnetic/appleseed,pjessesco/appleseed,dictoon/appleseed,gospodnetic/appleseed,Vertexwahn/appleseed,aytekaman/appleseed,gospodnetic/appleseed,aiivashchenko/appleseed,aiivashchenko/appleseed,dictoon/appleseed,est77/appleseed,gospodnetic/appleseed,gospodnetic/appleseed,aiivashchenko/appleseed,est77/appleseed,aiivashchenko/appleseed,dictoon/appleseed,appleseedhq/appleseed