diff --git a/apps/common/db/fields.py b/apps/common/db/fields.py
index 17feb68c4..791a03b5f 100644
--- a/apps/common/db/fields.py
+++ b/apps/common/db/fields.py
@@ -604,7 +604,7 @@ class JSONManyToManyField(models.JSONField):
             return None
         if isinstance(value, RelatedManager):
             value = value.value
-        return value
+        return json.dumps(value)
 
     def validate(self, value, model_instance):
         super().validate(value, model_instance)