Exceptions in "pdfbox_1_8_8" but not in "PDFBox_1_8_9-SNAPSHOT"

FILE_EXTENSION	COUNT
pdf	3

SELECT File_Extension, count(1) as COUNT from comparisons where SORT_STACK_TRACE_A <> '' and SORT_STACK_TRACE_B is null and JSON_EX_A is null and JSON_EX_B is null group by FILE_EXTENSION order by COUNT desc