ff4948fc08
I can't reproduce this on release or debug builds. But from the strack traces provided in a couple reports, it looks like the runtime pointer is null. This makes sense because BKE_previewimg_blend_read is not called here which is what allocates the runtime struct on file read. To maintain a "valid" PreviewImage in more code and avoid the complexity of making the runtime pointer optional, just allocate it in BLO_blendhandle_get_preview_for_id.
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