ID 326724 - Mari crashes when attempting to export a channel as flattened in the affected archive

Problem summary
In the affected archive, when exporting a channel as flattened, Mari will crash.

Customer reported version
3.3v1
Customer reported platform
centos7

Steps to reproduce

1) Open the affected archive

2) Switch your channel to Tex_specCol

3) Right click > Export > Export channel flattened

4) Select a directory path and choose 'Export All Patches'

5) Mari will crash 

Note: When exporting the unflattened channel, Mari works as expected

Workaround
Unknown.

Reproduced by support
Mari 4.0v1 - Windows 7/10, CentOS6, OS X 10.12.4
Mari 3.3v1
Mari 3.2v1
Mari 3.1v3
Mari 3.1v1
Mari 3.0v4
Mari 2.6v5 - Windows 7/10, CentOS6, OS X 10.12.4

Earliest version tested
Mari 2.6v5 

Expected behaviour
We should be able to successfully export both flattened and unflattened images.

Actual behaviour
Mari crashes consistently during the export process.