Prevent possible null ref exception due to threading issue.
Prevent possible null ref exception due to threading issue.

jmezach/NuGet2,akrisiun/NuGet,RichiCoder1/nuget-chocolatey,xoofx/NuGet,rikoe/nuget,mono/nuget,antiufo/NuGet2,oliver-feng/nuget,GearedToWar/NuGet2,mrward/nuget,pratikkagda/nuget,antiufo/NuGet2,dolkensp/node.net,alluran/node.net,xoofx/NuGet,rikoe/nuget,OneGet/nuget,jmezach/NuGet2,indsoft/NuGet2,jmezach/NuGet2,dolkensp/node.net,indsoft/NuGet2,xoofx/NuGet,pratikkagda/nuget,zskullz/nuget,zskullz/nuget,oliver-feng/nuget,RichiCoder1/nuget-chocolatey,rikoe/nuget,pratikkagda/nuget,RichiCoder1/nuget-chocolatey,mrward/nuget,antiufo/NuGet2,ctaggart/nuget,GearedToWar/NuGet2,indsoft/NuGet2,dolkensp/node.net,GearedToWar/NuGet2,oliver-feng/nuget,dolkensp/node.net,chocolatey/nuget-chocolatey,mono/nuget,alluran/node.net,pratikkagda/nuget,oliver-feng/nuget,chocolatey/nuget-chocolatey,akrisiun/NuGet,jholovacs/NuGet,RichiCoder1/nuget-chocolatey,alluran/node.net,pratikkagda/nuget,mrward/nuget,indsoft/NuGet2,zskullz/nuget,jmezach/NuGet2,mono/nuget,pratikkagda/nuget,mono/nuget,mrward/NuGet.V2,GearedToWar/NuGet2,jholovacs/NuGet,ctaggart/nuget,mrward/nuget,mrward/nuget,oliver-feng/nuget,chocolatey/nuget-chocolatey,mrward/NuGet.V2,OneGet/nuget,oliver-feng/nuget,xoofx/NuGet,chocolatey/nuget-chocolatey,jholovacs/NuGet,indsoft/NuGet2,antiufo/NuGet2,xoofx/NuGet,indsoft/NuGet2,chocolatey/nuget-chocolatey,xoofx/NuGet,jholovacs/NuGet,mrward/nuget,jmezach/NuGet2,RichiCoder1/nuget-chocolatey,antiufo/NuGet2,GearedToWar/NuGet2,jholovacs/NuGet,jholovacs/NuGet,antiufo/NuGet2,mrward/NuGet.V2,chocolatey/nuget-chocolatey,OneGet/nuget,rikoe/nuget,jmezach/NuGet2,RichiCoder1/nuget-chocolatey,OneGet/nuget,mrward/NuGet.V2,GearedToWar/NuGet2,ctaggart/nuget,zskullz/nuget,mrward/NuGet.V2,alluran/node.net,ctaggart/nuget,mrward/NuGet.V2