Bug to do a transfer from FTM to matic wFTM

[DanubioBlu]

Bug Description
Impossibile do a transfer from FTM to matic

Steps to Reproduce
I try to bridge 395 wFTM, i approve it but cannot transfer

Expected Behavior
to bridge the token

In the console show the following error:
GetAllowance error Error: invalid BigNumber string (argument="value", value="", code=INVALID_ARGUMENT, version=bignumber/5.0.5)
at t.makeError (3.d3b3b5a1.chunk.js:2:287403)
at t.throwError (3.d3b3b5a1.chunk.js:2:287545)
at t.throwArgumentError (3.d3b3b5a1.chunk.js:2:287622)
at Function.t.from (3.d3b3b5a1.chunk.js:2:298270)
at main.3c63242e.chunk.js:1:157945
at c (3.d3b3b5a1.chunk.js:2:2559401)
at Generator._invoke (3.d3b3b5a1.chunk.js:2:2559154)
at Generator.next (3.d3b3b5a1.chunk.js:2:2559760)
at n (3.d3b3b5a1.chunk.js:2:104136)
at s (3.d3b3b5a1.chunk.js:2:104339)