diff --git a/core/src/main/java/nl/tudelft/ewi/auta/core/dto/SubmitAppFeedbackDto.java b/core/src/main/java/nl/tudelft/ewi/auta/core/dto/SubmitAppFeedbackDto.java
index 1ad0fe037b99cca75cd68a900c2d8ce471ff2712..e09c0684841185702e7be62999535c7a4af4f1b7 100644
--- a/core/src/main/java/nl/tudelft/ewi/auta/core/dto/SubmitAppFeedbackDto.java
+++ b/core/src/main/java/nl/tudelft/ewi/auta/core/dto/SubmitAppFeedbackDto.java
@@ -35,6 +35,7 @@ public class SubmitAppFeedbackDto {
     /**
      * The feedback itself.
      */
+    @Nullable
     public String textualFeedback = "";
 
     /**