if ( strcmp( mlt_type, "producer" ) == 0 )
{
char *mlt_service = mlt_properties_get( properties, "mlt_service" );
- if ( mlt_properties_get( properties, "westley" ) == NULL && !strcmp( mlt_service, "tractor" ) )
+ if ( mlt_properties_get( properties, "westley" ) == NULL && ( mlt_service != NULL && !strcmp( mlt_service, "tractor" ) ) )
{
context->pass = 0;
serialise_tractor( context, service, node );