diff --git a/controllers/account.go b/controllers/account.go
index 7dde0493..cdaf83be 100644
--- a/controllers/account.go
+++ b/controllers/account.go
@@ -93,6 +93,10 @@ func (c *ApiController) Signup() {
 		c.ResponseError(err.Error())
 		return
 	}
+	if application == nil {
+		c.ResponseError(fmt.Sprintf(c.T("auth:The application: %s does not exist")), authForm.Application)
+		return
+	}
 
 	if !application.EnableSignUp {
 		c.ResponseError(c.T("account:The application does not allow to sign up new account"))