In method GETPLUGINS I find the following code:

  select * from VSEOEXTEND into table classList
    where REFCLSNAME = 'ZSAPLINK'
    and version = '1'.

  loop at classList into classLine.
    clsName = classLine-clsName.
    create object classObject type (clsName)
      exporting name = 'foo'.
    objtype = classObject->getObjectType( ).

If there exists a class inherited from ZSAPLINK that is defined as abstract this method dumps because of a missing errorhandling or exclusion of these classes.

Possible solutions:
- Exclusion of abstract classes in the selection
- Defining an interface that the plugins should implement and then search for objects implementing the interface. That would also find plugins that are further down the inheritanceline.