I had the exact same issue. My business made money and my husband's lost money, so mine was fine and his kept getting stuck at line 18 of the SE form. I ended up making sure that was the only error, then blanking out line 18 and not re-running the check. When I reviewed my return before filing, my form SE was in the package and there was not one there for my husband. That was fine since he did not owe any SE tax. I made sure that nothing was showing as being deferred for either of us and sent it in. I did also try all the suggested fixes, even the adding a large amount of income, then saying no to the deferral, then putting in a number for line 18, then taking the income back out, etc. and that did not work for me. I also tried deleting the form, but the error check put it back and wanted a number. Blanking out the field and ignoring the error is all I could do - that seems to have worked fine.
