Parse error in latest version 1.7.2, but worked in 1.5.1 with '#'

[kiruba-github]

The below expression format worked well and parsed as expected in version 1.5.1
But now I have tried to update the latest version 1.7.2 and it failed to parse the expression if contains '#' in whole app.
With out '#' it converts, but it supports special char in some other expressions.
Please clarify/suggest to resolve this to update the Package.

[Txn Details Insurers XXX/XXX # - 00000]
IF(ISNULLORWHITESPACE([XXXX XX XX - 000]) ,"" , [XXXXXXX XXX XXX # - 0000])