workaround for no previous price present

changedetectionio/processors/restock_diff.py

@@ -179,7 +179,8 @@ class perform_site_check(difference_detection_processor):
 
         if watch.get('follow_price_changes') and watch.get('restock') and update_obj.get('restock') and update_obj['restock'].get('price'):
             price = float(update_obj['restock'].get('price'))
-            previous_price = float(watch['restock'].get('price'))
+            # Default to current price if no previous price found
+            previous_price = float(watch['restock'].get('price', price))
 
             # It was different, but negate it further down
             if price != previous_price:

changedetectionio/tests/test_restock_itemprop.py

@@ -186,6 +186,7 @@ def test_itemprop_price_minmax_limit(client, live_server):
     res = client.get(url_for("index"))
     assert b'1890.45' in res.data
     assert b'unviewed' in res.data
+
     res = client.get(url_for("form_delete", uuid="all"), follow_redirects=True)
     assert b'Deleted' in res.data