diff --git a/CHANGELOG b/CHANGELOG
index bcb023d6ba0716a9ad3633212760f062676b0064..1953dd3dc1e410d01c488c80d65e51904c240c4a 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,9 @@
+smasch (1.0.0~beta.3-1) unstable; urgency=low
+
+  * bug fix: upgrade from 0.15 version containing subjects failed
+
+ -- Piotr Gawron <piotr.gawron@uni.lu>  Tue, 12 Jan 2021 10:00:00 +0200
+
 smasch (1.0.0~beta.2-1) unstable; urgency=low
 
   * bug fix: npm dependencies must be more strict
diff --git a/smash/web/migrations/0190_remove_study_related_fields.py b/smash/web/migrations/0190_remove_study_related_fields.py
index c95ddbfc084cd43f46ee672c19e653349e56c27e..6b7207d114ab7b1b9bf259b7fa120c5091d46d2f 100644
--- a/smash/web/migrations/0190_remove_study_related_fields.py
+++ b/smash/web/migrations/0190_remove_study_related_fields.py
@@ -38,156 +38,156 @@ def create_custom_fields(apps, schema_editor):
                                                                            type=CUSTOM_FIELD_TYPE_SELECT_LIST,
                                                                            study_id=GLOBAL_STUDY_ID,
                                                                            possible_values="N/A;Positive;Negative;Inconclusive",
-                                                                           default="N/A",
+                                                                           default_value="N/A",
                                                                            readonly=True)
         virus_test_2_result_field = CustomStudySubjectField.objects.create(name="Virus 1 RT-PCR",
                                                                            type=CUSTOM_FIELD_TYPE_SELECT_LIST,
                                                                            study_id=GLOBAL_STUDY_ID,
                                                                            possible_values="N/A;Positive;Negative;Inconclusive",
-                                                                           default="N/A",
+                                                                           default_value="N/A",
                                                                            readonly=True)
         virus_test_3_result_field = CustomStudySubjectField.objects.create(name="Virus 2 RT-PCR",
                                                                            type=CUSTOM_FIELD_TYPE_SELECT_LIST,
                                                                            study_id=GLOBAL_STUDY_ID,
                                                                            possible_values="N/A;Positive;Negative;Inconclusive",
-                                                                           default="N/A",
+                                                                           default_value="N/A",
                                                                            readonly=True)
         virus_test_4_result_field = CustomStudySubjectField.objects.create(name="Virus 3 RT-PCR",
                                                                            type=CUSTOM_FIELD_TYPE_SELECT_LIST,
                                                                            study_id=GLOBAL_STUDY_ID,
                                                                            possible_values="N/A;Positive;Negative;Inconclusive",
-                                                                           default="N/A",
+                                                                           default_value="N/A",
                                                                            readonly=True)
         virus_test_5_result_field = CustomStudySubjectField.objects.create(name="Virus 4 RT-PCR",
                                                                            type=CUSTOM_FIELD_TYPE_SELECT_LIST,
                                                                            study_id=GLOBAL_STUDY_ID,
                                                                            possible_values="N/A;Positive;Negative;Inconclusive",
-                                                                           default="N/A",
+                                                                           default_value="N/A",
                                                                            readonly=True)
         virus_test_1_updated_field = CustomStudySubjectField.objects.create(name="Visit 0 RT-PCR update date",
                                                                             type=CUSTOM_FIELD_TYPE_DATE,
                                                                             study_id=GLOBAL_STUDY_ID,
-                                                                            default="",
+                                                                            default_value="",
                                                                             readonly=True)
         virus_test_2_updated_field = CustomStudySubjectField.objects.create(name="Visit 1 RT-PCR update date",
                                                                             type=CUSTOM_FIELD_TYPE_DATE,
                                                                             study_id=GLOBAL_STUDY_ID,
-                                                                            default="",
+                                                                            default_value="",
                                                                             readonly=True)
         virus_test_3_updated_field = CustomStudySubjectField.objects.create(name="Visit 2 RT-PCR update date",
                                                                             type=CUSTOM_FIELD_TYPE_DATE,
                                                                             study_id=GLOBAL_STUDY_ID,
-                                                                            default="",
+                                                                            default_value="",
                                                                             readonly=True)
         virus_test_4_updated_field = CustomStudySubjectField.objects.create(name="Visit 3 RT-PCR update date",
                                                                             type=CUSTOM_FIELD_TYPE_DATE,
                                                                             study_id=GLOBAL_STUDY_ID,
-                                                                            default="",
+                                                                            default_value="",
                                                                             readonly=True)
         virus_test_5_updated_field = CustomStudySubjectField.objects.create(name="Visit 4 RT-PCR update date",
                                                                             type=CUSTOM_FIELD_TYPE_DATE,
                                                                             study_id=GLOBAL_STUDY_ID,
-                                                                            default="",
+                                                                            default_value="",
                                                                             readonly=True)
         virus_test_1_collection_date_field = CustomStudySubjectField.objects.create(
             name="Visit 0 RT-PCR collection date",
             type=CUSTOM_FIELD_TYPE_DATE,
             study_id=GLOBAL_STUDY_ID,
-            default="",
+            default_value="",
             readonly=True)
         virus_test_2_collection_date_field = CustomStudySubjectField.objects.create(
             name="Visit 1 RT-PCR collection date",
             type=CUSTOM_FIELD_TYPE_DATE,
             study_id=GLOBAL_STUDY_ID,
-            default="",
+            default_value="",
             readonly=True)
         virus_test_3_collection_date_field = CustomStudySubjectField.objects.create(
             name="Visit 2 RT-PCR collection date",
             type=CUSTOM_FIELD_TYPE_DATE,
             study_id=GLOBAL_STUDY_ID,
-            default="",
+            default_value="",
             readonly=True)
         virus_test_4_collection_date_field = CustomStudySubjectField.objects.create(
             name="Visit 3 RT-PCR collection date",
             type=CUSTOM_FIELD_TYPE_DATE,
             study_id=GLOBAL_STUDY_ID,
-            default="",
+            default_value="",
             readonly=True)
         virus_test_5_collection_date_field = CustomStudySubjectField.objects.create(
             name="Visit 4 RT-PCR collection date",
             type=CUSTOM_FIELD_TYPE_DATE,
             study_id=GLOBAL_STUDY_ID,
-            default="",
+            default_value="",
             readonly=True)
         virus_test_1_iga_status_field = CustomStudySubjectField.objects.create(
             name="Visit 0 IgA Status",
             type=CUSTOM_FIELD_TYPE_SELECT_LIST,
             study_id=GLOBAL_STUDY_ID,
             possible_values="N/A;Positive;Negative;Borderline",
-            default="N/A",
+            default_value="N/A",
             readonly=True)
         virus_test_2_iga_status_field = CustomStudySubjectField.objects.create(
             name="Visit 1 IgA Status",
             type=CUSTOM_FIELD_TYPE_SELECT_LIST,
             study_id=GLOBAL_STUDY_ID,
             possible_values="N/A;Positive;Negative;Borderline",
-            default="N/A",
+            default_value="N/A",
             readonly=True)
         virus_test_3_iga_status_field = CustomStudySubjectField.objects.create(
             name="Visit 2 IgA Status",
             type=CUSTOM_FIELD_TYPE_SELECT_LIST,
             study_id=GLOBAL_STUDY_ID,
             possible_values="N/A;Positive;Negative;Borderline",
-            default="N/A",
+            default_value="N/A",
             readonly=True)
         virus_test_4_iga_status_field = CustomStudySubjectField.objects.create(
             name="Visit 3 IgA Status",
             type=CUSTOM_FIELD_TYPE_SELECT_LIST,
             study_id=GLOBAL_STUDY_ID,
             possible_values="N/A;Positive;Negative;Borderline",
-            default="N/A",
+            default_value="N/A",
             readonly=True)
         virus_test_5_iga_status_field = CustomStudySubjectField.objects.create(
             name="Visit 4 IgA Status",
             type=CUSTOM_FIELD_TYPE_SELECT_LIST,
             study_id=GLOBAL_STUDY_ID,
             possible_values="N/A;Positive;Negative;Borderline",
-            default="N/A",
+            default_value="N/A",
             readonly=True)
         virus_test_1_igg_status_field = CustomStudySubjectField.objects.create(
             name="Visit 0 IgG Status",
             type=CUSTOM_FIELD_TYPE_SELECT_LIST,
             study_id=GLOBAL_STUDY_ID,
             possible_values="N/A;Positive;Negative;Borderline",
-            default="N/A",
+            default_value="N/A",
             readonly=True)
         virus_test_2_igg_status_field = CustomStudySubjectField.objects.create(
             name="Visit 1 IgG Status",
             type=CUSTOM_FIELD_TYPE_SELECT_LIST,
             study_id=GLOBAL_STUDY_ID,
             possible_values="N/A;Positive;Negative;Borderline",
-            default="N/A",
+            default_value="N/A",
             readonly=True)
         virus_test_3_igg_status_field = CustomStudySubjectField.objects.create(
             name="Visit 2 IgG Status",
             type=CUSTOM_FIELD_TYPE_SELECT_LIST,
             study_id=GLOBAL_STUDY_ID,
             possible_values="N/A;Positive;Negative;Borderline",
-            default="N/A",
+            default_value="N/A",
             readonly=True)
         virus_test_4_igg_status_field = CustomStudySubjectField.objects.create(
             name="Visit 3 IgG Status",
             type=CUSTOM_FIELD_TYPE_SELECT_LIST,
             study_id=GLOBAL_STUDY_ID,
             possible_values="N/A;Positive;Negative;Borderline",
-            default="N/A",
+            default_value="N/A",
             readonly=True)
         virus_test_5_igg_status_field = CustomStudySubjectField.objects.create(
             name="Visit 4 IgG Status",
             type=CUSTOM_FIELD_TYPE_SELECT_LIST,
             study_id=GLOBAL_STUDY_ID,
             possible_values="N/A;Positive;Negative;Borderline",
-            default="N/A",
+            default_value="N/A",
             readonly=True)
 
         for subject in StudySubject.objects.all():