public class Repro {
    static String name() {
        return "x";
    }

    public static void main(String[] args) {
        var n = name();
        if (n == null) {
            throw new IllegalArgumentException("no name");
        }
    }
}

Exception in thread "main" java.lang.RuntimeException: 
Error while checking CtMethodImpl
  on main(String[] args) { 
  with 
Error while checking CtBlockImpl
  on { 
  with 
Error while checking CtIfImpl
  on if (n == null) { 
  with Cannot invoke "spoon.reflect.reference.CtTypeReference.getQualifiedName()" because the return value of "spoon.reflect.code.CtBinaryOperator.getType()" is null
Caused by: java.lang.RuntimeException: 
Error while checking CtBlockImpl
  on { 
  with