A sample project is difficult, but in the documentation from FreeMarker (http://www.freemarker.org/docs/dgui_template_exp.html#dgui_template_exp_missing) it's more in detail explained what's going wrong.
If the field mouse = NULL the variable ${mouse} in a template gives the error mentioned above.
The workaround freemarker gives is: Assume no variable called mouse is present or has the value NULL, in the template you had to use the following syntax:
I think this is the correct solution
JP
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