bugfix for bfacefactors #550

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - push	25m 35s
Julia 1.6 - macos-latest - x64 - push	33m 24s
Documentation	18m 50s
Julia 1.6 - windows-latest - x64 - push	39m 15s
Julia 1 - ubuntu-latest - x64 - push	14m 23s
Julia 1 - macos-latest - x64 - push	14m 47s
Julia 1 - windows-latest - x64 - push	17m 54s
Julia nightly - ubuntu-latest - x64 - push	22m 54s
Julia nightly - macos-latest - x64 - push	26m 39s
Julia nightly - windows-latest - x64 - push	26m 30s
	4h 0m 11s

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