From 05959eaf700c3a505807e62db6ad13b2655cc65e Mon Sep 17 00:00:00 2001
From: Tyler Goodlet <jgbt@protonmail.com>
Date: Tue, 19 Sep 2023 15:56:47 -0400
Subject: [PATCH] Always ensure symcache mkt pair entry is valid type

---
 piker/accounting/_pos.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/piker/accounting/_pos.py b/piker/accounting/_pos.py
index 1a2378da..1b305009 100644
--- a/piker/accounting/_pos.py
+++ b/piker/accounting/_pos.py
@@ -543,6 +543,11 @@ class Account(Struct):
 
             if not (pos := pps.get(bs_mktid)):
 
+                assert isinstance(
+                    mkt,
+                    MktPair,
+                )
+
                 # if no existing pos, allocate fresh one.
                 pos = pps[bs_mktid] = Position(
                     mkt=mkt,