diff --git a/theses.yaml b/theses.yaml
index b726f6b..a2ee2d8 100644
--- a/theses.yaml
+++ b/theses.yaml
@@ -1103,7 +1103,7 @@
                   Particularly in the case of thesis with external supervision (e.g. commissioned by a company), your thesis may be subject to an NDA
                   (non-disclosure agreement).
                   You can adjust your consent for publication again after submission of the thesis and grading."
-              default: null
+              default: ""
               optional: true
               presets: 
                 - text: "arbeit (mit erg dateien)"
@@ -2058,7 +2058,8 @@
                   Particularly in the case of thesis with external supervision (e.g. commissioned by a company), your thesis may be subject to an NDA
                   (non-disclosure agreement).
                   You can adjust your consent for publication again after grading."
-              optional: false           
+              optional: false
+              default: ""
         "kommunikation": *kommunikation-form
         "datum, abgabe, tatsl": &abgabedatum-form-tatsl
           - "5.6":