**Blender Version**
Broken: 2.69
**Short description of error**
Copy-button and operator on command line work, but it shouldn't appear in the spacebar menu, since it will always raise an error:
> The object the data pointer refers to is not a valid modifier
http://blender.stackexchange.com/questions/6960/how-do-i-successfully-copy-modifiers
**Exact steps for others to reproduce the error**
Hit Spacebar over 3D View and run Copy Modifier operator