This is a WebKitGTK+ bug as far as I can tell. There was a similar crasher in older versions and there's a workaround for it.
- One way is to enable the workaround - to not destroy the thumbnail view - for whatever WebKit version is affected here.
- A more general option is to put the thumbnail view in a separate notebook and do this regardless of the WebKitGTK+ version.
This is a WebKitGTK+ bug as far as I can tell. There was a similar crasher in older versions and there's a workaround for it.
- One way is to enable the workaround - to not destroy the thumbnail view - for whatever WebKit version is affected here.
- A more general option is to put the thumbnail view in a separate notebook and do this regardless of the WebKitGTK+ version.