replaceAll - Not working for numbers?

[talendtester]

I am trying to remove numbers from the myNumbers column which is a String but I am getting the error "java.lang.NullPointerException".

My tMap looks like this:

row3.myNumbers.replaceAll("[0-9]","").trim();

My sample file:

myLetters,myNumbers
abc,A123
def,B456
hij,C789
klm,D010

Any ideas? 

[Anonymous]

Need to check if there exist null value in this column, you can change the expression to:
row3.myNumbers==null?null:row3.myNumbers .replaceAll("[0-9]","").trim()

Regards
Shong