diff --git a/src/containers/allelePage/AlleleSummary.js b/src/containers/allelePage/AlleleSummary.js
index 38e21743..8a506460 100644
--- a/src/containers/allelePage/AlleleSummary.js
+++ b/src/containers/allelePage/AlleleSummary.js
@@ -35,7 +35,7 @@ const AlleleSummary = ({allele}) => {
         {allele.constructs && allele.constructs.length && (
           <CommaSeparatedList>
             {allele.constructs.map(construct => (
-              <DataSourceLink key={construct.id} reference={construct.crossReferenceMap.primary}>
+              <DataSourceLink key={construct.id} reference={construct.crossReferenceMap?.primary}>
                 <span dangerouslySetInnerHTML={{__html: construct.name}} />
               </DataSourceLink>
             ))}
diff --git a/src/containers/allelePage/AlleleTransgenicConstructs.js b/src/containers/allelePage/AlleleTransgenicConstructs.js
index 17682d26..1e158109 100644
--- a/src/containers/allelePage/AlleleTransgenicConstructs.js
+++ b/src/containers/allelePage/AlleleTransgenicConstructs.js
@@ -39,7 +39,7 @@ const AlleleTransgenicConstructs = ({constructs}) => {
 
             <AttributeLabel>Knock-down Targets</AttributeLabel>
             <AttributeValue placeholder='None'>
-              {construct.targetGenes.length && (
+              {construct.targetGenes?.length && (
                 <CommaSeparatedGeneList genes={construct.targetGenes} />
               )}
             </AttributeValue>