diff --git a/changelog_unreleased/1540-ldap-login-fails.md b/changelog_unreleased/1540-ldap-login-fails.md
new file mode 100644
index 000000000..b10efe314
--- /dev/null
+++ b/changelog_unreleased/1540-ldap-login-fails.md
@@ -0,0 +1,5 @@
+[bug] piotrek
+
+    Fixed a bug where login was not possible using
+    the LDAP authentication method.
+    (Gitlab #1540)
\ No newline at end of file
diff --git a/webui/src/app/login-screen/login-screen.component.ts b/webui/src/app/login-screen/login-screen.component.ts
index 33993adc6..395d22de8 100644
--- a/webui/src/app/login-screen/login-screen.component.ts
+++ b/webui/src/app/login-screen/login-screen.component.ts
@@ -147,7 +147,7 @@ export class LoginScreenComponent implements OnInit {
     signIn() {
         Object.keys(this.loginForm.controls).forEach((k) => this.loginForm.get(k).markAsDirty())
         if (this.loginForm.valid) {
-            this.auth.login(this.f?.authenticationMethod?.id, this.f?.identifier, this.f?.secret, this.returnUrl)
+            this.auth.login(this.f.authenticationMethod.id, this.f.identifier, this.f.secret, this.returnUrl)
         }
     }