diff --git a/lang/en.json b/lang/en.json
index 52419a5aa134e8355fa0278f63b5a763edab54f2..09f1a98bbbea0d54e239c876fcfab59c351908c7 100755
--- a/lang/en.json
+++ b/lang/en.json
@@ -405,6 +405,7 @@
         "validateDocumentWarning": "You are about to validate this document!",
         "certifiedDocument": "Certified document",
         "certifiedDocumentMsg": "The document was signed by digital certificate, you cannot affix a stamp.",
-        "errorUserSignType": "Signers without a certificate must be present before signers with a certificate."
+        "errorUserSignType": "Signers without a certificate must be present before signers with a certificate.",
+        "fortifyReadException": "Error when communicating with Fortify"
     }
-}
\ No newline at end of file
+}
diff --git a/lang/fr.json b/lang/fr.json
index c15b60b5e50d5002f0bf4244b70d5d0919fce891..2320c6cfdf7416a5ec35b46b0f48db123a69b272 100755
--- a/lang/fr.json
+++ b/lang/fr.json
@@ -402,6 +402,7 @@
 		"validateDocumentWarning": "Vous êtes sur le point de valider ce document !",
 		"certifiedDocument": "Document certifié",
 		"certifiedDocumentMsg": "Le document a été signé par certificat numérique, vous ne pouvez pas apposer de griffe.",
-		"errorUserSignType": "Les signataires sans certificat doivent être présent avant les signataires avec certificat."
+		"errorUserSignType": "Les signataires sans certificat doivent être présent avant les signataires avec certificat.",
+		"fortifyReadException": "Erreur lors de la communication avec Fortify"
 	}
 }
diff --git a/src/frontend/app/service/signature-method/signature-method-modal.component.ts b/src/frontend/app/service/signature-method/signature-method-modal.component.ts
index 69a2feb68c8bdf3c7bfa3ff3c54e39e626813d9e..43bde9276931f15018015d1f82c7740e98154884 100644
--- a/src/frontend/app/service/signature-method/signature-method-modal.component.ts
+++ b/src/frontend/app/service/signature-method/signature-method-modal.component.ts
@@ -65,10 +65,17 @@ export class SignatureMethodModalComponent implements OnInit {
         }).then(async (load: HTMLIonLoadingElement) => {
             load.present();
 
-            this.provider = await certData.detail.server.getCrypto(certData.detail.providerId);
-            this.cert = await this.provider.certStorage.getItem(certData.detail.certificateId);
-            this.certPem = await this.provider.certStorage.exportCert('pem', this.cert);
-            this.privateKey = await this.provider.keyStorage.getItem(certData.detail.privateKeyId);
+            try {
+                this.provider = await certData.detail.server.getCrypto(certData.detail.providerId);
+                this.cert = await this.provider.certStorage.getItem(certData.detail.certificateId);
+                this.certPem = await this.provider.certStorage.exportCert('pem', this.cert);
+                this.privateKey = await this.provider.keyStorage.getItem(certData.detail.privateKeyId);
+            } catch (e) {
+                this.notificationService.error('lang.fortifyReadException');
+                load.dismiss();
+                this.modalController.dismiss(false);
+                return;
+            }
 
             this.certificate = {
                 certificate: this.certPem
@@ -94,7 +101,15 @@ export class SignatureMethodModalComponent implements OnInit {
 
             console.log('hashDocumentHex', hashDocumentHex);
 
-            const hashSignature = await this.provider.subtle.sign(alg, this.privateKey, hashDocumentHex);
+            let hashSignature;
+            try {
+                hashSignature = await this.provider.subtle.sign(alg, this.privateKey, hashDocumentHex);
+            } catch (e) {
+                this.notificationService.error('lang.fortifyReadException');
+                resolve(false);
+                return of(false);
+            }
+
 
             console.log('hashSignature', hashSignature);