Error on clinic page when moving slave from clinic

FC version 0.10.7.1, mod version: 3.5.4, build: 1076, commit: c47b4429

Full error message:

<<if _CL > 2>> 		$clinicNameCaps is busy. Patients occupy many of the beds; most are alert, but a few are dozing under medication designed to promote healing through deep rest. 	<<elseif _CL > 0>> 		$clinicNameCaps is sparsely populated. Patients occupy a few of the beds; most are alert, but a few are dozing under medication designed to promote healing through deep rest. 	<<elseif _S.Nurse != 0>> 		_S.Nurse.slaveName is alone in the clinic, and has nothing to do but keep the place spotlessly clean and ready for its next patients. 	<<else>> 		$clinicNameCaps is empty and quiet. 		<div class="choices" style="font-style:normal"> 			[[Decommission the Clinic|Main][$clinic = 0, $clinicDecoration = "standard", $clinicUpgradeScanner = 0, $clinicUpgradeFilters = 0, $clinicUpgradePurge = 0, $clinicInflateBelly = 0, $clinicSpeedGestation = 0]] 		</div> 	<</if>>
TypeError: Cannot read property 'slaveName' of null
    at Object.variableGet (<path>/FC_pregmod.html:467702:21)
    at Object.handler (<path>/FC_pregmod.html:471286:43)
    at Wikifier.subWikify (<path>/FC_pregmod.html:469234:45)
    at new Wikifier (<path>/FC_pregmod.html:469133:10)
    at MacroContext.handler (<path>/FC_pregmod.html:473211:7)
    at Object.handler (<path>/FC_pregmod.html:470436:24)
    at Wikifier.subWikify (<path>/FC_pregmod.html:469234:45)
    at Object.handler (<path>/FC_pregmod.html:471981:10)
    at Wikifier.subWikify (<path>/FC_pregmod.html:469234:45)
    at new Wikifier (<path>/FC_pregmod.html:469133:10)