The multijob in question is essentially a lot of small jobs executed in parallel.
As soon as one job completes, every other is prefaced with a java.lang.NullPointerException

like this:
Starting build job fv-gcr-master-tc_033
Starting build job fv-gcr-master-tc_011
Finished Build : #34 of Job : fv-gcr-master-tc_038 with status : SUCCESS
java.lang.NullPointerExceptionFinished Build : #91 of Job : fv-gcr-master-tc_024 with status : SUCCESS
java.lang.NullPointerExceptionFinished Build : #91 of Job : fv-gcr-master-tc_030 with status : SUCCESS
java.lang.NullPointerExceptionFinished Build : #258 of Job : fv-gcr-master-tc_005 with status : SUCCESS
java.lang.NullPointerExceptionFinished Build : #20 of Job : fv-gcr-master-tc_027 with status : ABORTED
java.lang.NullPointerExceptionFinished Build : #91 of Job : fv-gcr-master-tc_023 with status : SUCCESS