Fix crash

tournaments/models/tournament.py

@@ -704,25 +704,24 @@ class Tournament(models.Model):
 
         # all started matches have ended, possibly
         last_finished_match = self.last_finished_match()
-
-        round = last_finished_match.round
-        if round is None: # when the last finished match is in the group stage
-            round = self.round_set.filter(parent__isnull=True).order_by('-index').first()
-
-        if round:
-            # print(f'last_finished_match = {last_finished_match.name}')
-            round_root_index = round.root_round().index
-            # print(f'round_index = {round_root_index}')
-            if round_root_index == 0:
-                return round
-            else:
-                round = self.round_set.filter(parent=None,index=round_root_index-1).first()
-                if round:
+        if last_finished_match:
+            round = last_finished_match.round
+            if round is None: # when the last finished match is in the group stage
+                round = self.round_set.filter(parent__isnull=True).order_by('-index').first()
+
+            if round:
+                # print(f'last_finished_match = {last_finished_match.name}')
+                round_root_index = round.root_round().index
+                # print(f'round_index = {round_root_index}')
+                if round_root_index == 0:
                     return round
                 else:
-                    return None
-        else:
-            return None
+                    round = self.round_set.filter(parent=None,index=round_root_index-1).first()
+                    if round:
+                        return round
+                    else:
+                        return None
+        return None
 
     def last_started_match(self):
         matches = [m for m in self.all_matches(False) if m.start_date]