320c2e8878
The first input of the compositor Mix node determines resolution, leading to situation when the second input will always be attempted to be evaluated. If the first input is a longer image sequence than the second input it leads to a crash. Do a null-pointer check and return transparent image in this cases, similar to what the Movie Clip operation is doing. Pull Request: https://projects.blender.org/blender/blender/pulls/123493