An exception was generated in the client library an internal global variable, ctWNGV, was NULL. For example, if an application using the c-tree multi-threaded client library created a thread using a system thread creation function like pthread_create() and then called CLIFIL() without first calling ctThrdAttach(), CLIFIL()’s internal call would raise an exception because ctWNGV was NULL. Logic has been modified to eliminate this exception.