fix(shs-5975): fix php error #1585

Job	Run time
set_sites	38s
lint_theme	35s
test_phpunit	1m 25s
test_new_site	13m 32s
test_existing_site (aaas)	8m 44s
test_existing_site (aarcs)	8m 24s
test_existing_site (biology)	11m 37s
test_existing_site (english)	5m 17s
test_existing_site (feminist)	7m 9s
test_existing_site (francestanford)	6m 5s
test_existing_site (hs_design)	6m 25s
test_existing_site (memorylab)	5m 44s
test_existing_site (politicalscience)	8m 42s
test_existing_site (psychology)	8m 23s
deploy_branch	0s
	1h 32m 40s

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