Remove NULL ObjectReference #393

Job	Run time
binding-tests (Immix, Default) / build-test-stdlib	51m 10s
binding-tests (Immix, Default) / build-test-other	1h 49m 58s
binding-tests (Immix, Default) / build-debug	28m 14s
binding-tests (Immix, Default) / build-test-LinearAlgebra	2h 7m 37s
binding-tests (Immix, Non_Moving) / build-debug	24m 19s
binding-tests (Immix, Non_Moving) / build-test-LinearAlgebra	2h 5m 13s
binding-tests (Immix, Non_Moving) / build-test-other	1h 50m 25s
binding-tests (Immix, Non_Moving) / build-test-stdlib	47m 16s
binding-tests (StickyImmix, Default) / build-debug	19m 27s
binding-tests (StickyImmix, Default) / build-test-LinearAlgebra	2h 6m 40s
binding-tests (StickyImmix, Default) / build-test-other	1h 46m 36s
binding-tests (StickyImmix, Default) / build-test-stdlib	49m 21s
binding-tests (StickyImmix, Non_Moving) / build-debug	19m 2s
binding-tests (StickyImmix, Non_Moving) / build-test-LinearAlgebra	1h 50m 14s
binding-tests (StickyImmix, Non_Moving) / build-test-other	1h 45m 50s
binding-tests (StickyImmix, Non_Moving) / build-test-stdlib	49m 27s
	20h 10m 49s

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