diff --git a/freqtrade/rpc/rpc.py b/freqtrade/rpc/rpc.py
index f1e6b1d12..5244963df 100644
--- a/freqtrade/rpc/rpc.py
+++ b/freqtrade/rpc/rpc.py
@@ -1137,7 +1137,7 @@ class RPC:
             if key:
                 data = trade.get_custom_data(key=key)
                 if data:
-                    custom_data = [data]
+                    custom_data.append(data)
             else:
                 custom_data.extend(trade.get_all_custom_data())