diff --git a/seminar/admin.py b/seminar/admin.py
index 89901c6b..1711108b 100644
--- a/seminar/admin.py
+++ b/seminar/admin.py
@@ -416,9 +416,9 @@ class ProblemAdmin(VersionAdmin):
         readonly_fields = ['timestamp', 'import_dakos_id']
         if not obj:
             return readonly_fields
-        if obj.cislo_zadani.faze != 'admin':
+        if obj.cislo_zadani and obj.cislo_zadani.faze != 'admin':
             readonly_fields += ['nazev', 'text_zadani', 'body']
-        if obj.cislo_reseni.faze != 'admin':
+        if obj.cislo_reseni and obj.cislo_reseni.faze != 'admin':
             readonly_fields += ['text_reseni']
         return readonly_fields