diff --git a/src/app/search/browsing/browsing.component.ts b/src/app/search/browsing/browsing.component.ts
index b3751461..0ea816f4 100644
--- a/src/app/search/browsing/browsing.component.ts
+++ b/src/app/search/browsing/browsing.component.ts
@@ -552,7 +552,7 @@ export class BrowsingComponent implements OnInit {
     getListName(alphaRes: any): string {
         switch (this.resTypeSelected) {
             case "author": {
-                return alphaRes.hasFirstName ? `${alphaRes.hasLastName[0].value}, ${alphaRes.hasFirstName[0].value}` : alphaRes.hasLastName[0].value;
+                return (alphaRes.hasFirstName && alphaRes.hasFirstName[0].value !== "_") ? `${alphaRes.hasLastName[0].value}, ${alphaRes.hasFirstName[0].value}` : alphaRes.hasLastName[0].value;
             }
             case "book": {
                 return alphaRes.hasBookTitle[0].value;
diff --git a/src/app/search/results/pipe/bibliography.pipe.ts b/src/app/search/results/pipe/bibliography.pipe.ts
index 9d7df411..c8939195 100644
--- a/src/app/search/results/pipe/bibliography.pipe.ts
+++ b/src/app/search/results/pipe/bibliography.pipe.ts
@@ -9,7 +9,7 @@ export class BibliographyPipe implements PipeTransform {
         const book = detailPas.occursIn[0];
 
         const authors = book.isWrittenBy
-            .map(author => author.hasFirstName ? {firstName: author.hasFirstName[0].value, lastName: author.hasLastName[0].value} :
+            .map(author => (author.hasFirstName && author.hasFirstName[0].value !== "_") ? {firstName: author.hasFirstName[0].value, lastName: author.hasLastName[0].value} :
                 {lastName: author.hasLastName[0].value}
             )
             .sort((author1, author2) => author1.lastName < author2.lastName ? -1 : (author1.lastName > author2.lastName ? 1 : 0)
diff --git a/src/app/search/results/pipe/title.pipe.ts b/src/app/search/results/pipe/title.pipe.ts
index 1277e79c..a53e6c5a 100644
--- a/src/app/search/results/pipe/title.pipe.ts
+++ b/src/app/search/results/pipe/title.pipe.ts
@@ -9,7 +9,7 @@ export class TitlePipe implements PipeTransform {
         const book = passage.occursIn[0];
 
         const authors = book.isWrittenBy
-            .map(author => author.hasFirstName ? {firstName: author.hasFirstName[0].value, lastName: author.hasLastName[0].value} :
+            .map(author => (author.hasFirstName && author.hasFirstName[0].value !== "_") ? {firstName: author.hasFirstName[0].value, lastName: author.hasLastName[0].value} :
                 {lastName: author.hasLastName[0].value}
             )
             .sort((author1, author2) => author1.lastName < author2.lastName ? -1 : (author1.lastName > author2.lastName ? 1 : 0)