Solr pre-processing (indexing step1 ) failing after applying apar 50891 - Null pointer exception

This is one of potential issue after applying APAR 50891. Solr pre-processing fails on following file

wc-dataimport-preprocess-catgroup-global-sequence.xml with exception null pointer exception.

Here is solution.

This feature don't like null values in sequence column. just try to run queries inside wc-dataimport-preprocess-catgroup-global-sequence.xml and if you observe  any null value in sequence column. Update it with 0 value.