In http://trac.webkit.org/changeset/153511 I made convertImageToBitmap return null instead of dereferencing the null ShareableBitmap, but missed the place where we dereference the return value, and I missed that because I simultaneously fixed the one reproducible case of getting a null into this method in the first place :( Add the second null-deref. <rdar://problem/14650652>
Created attachment 209316 [details] patch
http://trac.webkit.org/changeset/154433