diff --git a/src/app/pombase-api.service.ts b/src/app/pombase-api.service.ts
index f79e7bba..8a819e01 100644
--- a/src/app/pombase-api.service.ts
+++ b/src/app/pombase-api.service.ts
@@ -1184,7 +1184,7 @@ export class PombaseAPIService {
     for (let fieldName of ['cv_annotations',
                            'genes_by_uniquename', 'genotypes_by_uniquename',
                            'alleles_by_uniquename', 'references_by_uniquename',
-                           'terms_by_termid', 'annotation_details', 'gocams']) {
+                           'terms_by_termid', 'annotation_details']) {
       if (typeof(json[fieldName]) === 'undefined') {
         json[fieldName] = {};
       }
@@ -1210,6 +1210,10 @@ export class PombaseAPIService {
       json.gene_history = [];
     }
 
+    if (!json.gocams) {
+      json.gocams = [];
+    }
+
     let genesByUniquename = json.genes_by_uniquename as GeneMap;
     let genotypesByUniquename = json.genotypes_by_uniquename as GenotypeMap;
     let allelesByUniquename = json.alleles_by_uniquename as AlleleMap;