diff --git a/komga/src/main/kotlin/org/gotson/komga/infrastructure/security/UserAgentWebAuthenticationDetails.kt b/komga/src/main/kotlin/org/gotson/komga/infrastructure/security/UserAgentWebAuthenticationDetails.kt
index 07da0c9dd..ab964ff7a 100644
--- a/komga/src/main/kotlin/org/gotson/komga/infrastructure/security/UserAgentWebAuthenticationDetails.kt
+++ b/komga/src/main/kotlin/org/gotson/komga/infrastructure/security/UserAgentWebAuthenticationDetails.kt
@@ -5,5 +5,5 @@ import org.springframework.security.web.authentication.WebAuthenticationDetails
 import javax.servlet.http.HttpServletRequest
 
 class UserAgentWebAuthenticationDetails(request: HttpServletRequest) : WebAuthenticationDetails(request) {
-  val userAgent: String = request.getHeader(HttpHeaders.USER_AGENT)
+  val userAgent: String = request.getHeader(HttpHeaders.USER_AGENT).orEmpty()
 }