This should at least prevent crash in [#35172]...

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56451 954f8c5b-7b00-dc11-b283-0030488c597c
Actually, this should do better, sorry for the noise :/

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56452 954f8c5b-7b00-dc11-b283-0030488c597c