"Harmful content in the input!" message when using certain search strings

"Harmful content in the input!" message when using certain search strings

When we search for certain terms in PMP we receive a message:
 
Harmful content in the input !
 
An error when processing the request....
 
Password Manager Pro has detected harmful contents in the data you have entered and hence cannot process the request.  Please contact your administrator for more details.
 
Do you know what this is and how can we add "safe" search terms to the list that this function is refering to?
 
Thanks!
 
 
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