diff --git a/backtrader/brokers/bbroker.py b/backtrader/brokers/bbroker.py
index eba247008..475748454 100644
--- a/backtrader/brokers/bbroker.py
+++ b/backtrader/brokers/bbroker.py
@@ -23,6 +23,7 @@
 
 import collections
 import datetime
+import math
 
 import backtrader as bt
 from backtrader.comminfo import CommInfoBase
@@ -432,6 +433,9 @@ def _get_value(self, datas=None, lever=False):
         for data in datas or self.positions:
             comminfo = self.getcommissioninfo(data)
             position = self.positions[data]
+            if math.isnan(data.close[0]):
+                # position inherently has no value.
+                continue
             # use valuesize:  returns raw value, rather than negative adj val
             if not self.p.shortcash:
                 dvalue = comminfo.getvalue(position, data.close[0])