Call Web Service node pauses / error

hi there,
we have an issue with the node "call web service". We are sending some information to "System A" by using the web service. But if "System A" is not available the web service node just stops with an error. 

Though the flag "Pause Node on HTTP Error" is set to false.

I would like to handle the error in the process afterwards but this is not possible in this case. Is an easy solution available to handle this problem ? Otherwise I need think about a workaround.

thanks

Yusuf