Expression is not defined for a variable in email notification activity

Hi All,

I am working on NWDS SP05 PAT0001. I have an email notification activity in BPM process flow. The expression is not defined for one of the variables getting used, even though I could build and deploy. But the process went into suspended state at email notification activity step because of the reason that expression is not defined for the variable.

Is there anything that we can do in runtime to make that process work. Please someone let me know if there is any solution for this issue without making any changes in design time. Awaiting for your help.

Thanks in advance,

Madhurima