The following has evaluated to null or missing:
==> doctorsToSpecialities.items  [in template "50514338544647#20120#null" at line 4, column 16]

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Tip: It's the step after the last dot that caused this error, not those before it.
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Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
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FTL stack trace ("~" means nesting-related):
	- Failed at: #list doctorsToSpecialities.items as ...  [in template "50514338544647#20120#null" at line 4, column 9]
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1<#assign doctorsToSpecialities=(restClient.get("/c/doctors/${ObjectEntry_objectEntryId.getData()}/doctorsToSpecialities?fields=specialtyName%2Cid")) /> 

2<#assign specialtyName ="" /> 

3<#if doctorsToSpecialities?has_content> 

4	<#list doctorsToSpecialities.items as doctorsToSpeciality> 

5		<#if doctorsToSpeciality.specialtyName?exists> 

6			<#assign specialtyName = doctorsToSpeciality.specialtyName /> 

7			    <#break> 

8			</#if> 

9		</#list> 

10</#if> 

11	<#if (ObjectField_jobTitle.getData())?has_content> 

12	${ObjectField_jobTitle.getData()} 

13		<#if specialtyName?has_content> 

14	, ${specialtyName} 

15 </#if> 

16</#if>