ID 488123 - Re-loading an image repeatedly in the Shader Tree results in a crash

Problem summary
Re-loading an image repeatedly in the Shader Tree results in a crash.
 
Customer reported version
modo.15.1v1
 
Customer reported platform
windows10
 
Steps to reproduce
 
1) Load an Image into the Shader Tree.

2) In the Properties select the Image field under Image map.

3) Click again to close it.
 
4) Repeat 3-4 quickly until Modo crashes.
 
Expected behaviour
It should repeatedly open and close.
 
Actual behaviour
Modo crashes.
 
Workaround
Unknown. 
 
Reproduced by support
 
This bug has been reproduced in:
15.1v1 - Windows 10
15.0v1 - Windows 10 -regression
 
Unable to reproduce bug in:
14.2v2 - Windows 10
 
Earliest version tested
14.2v2 - This issue doesn't appear in this version and has regressed.