Hack to ignore dataframes in process_event, code seems to be written against namedicts.

zipline/finance/performance.py

@@ -209,6 +209,15 @@ class PerformanceTracker():
     def process_event(self, event):
         self.event_count += 1
 
+        # TODO: This seems to get both dataframes and namedicts?
+        # I can't find a corresponding test for this
+        # function so not sure if this is the desired behavior or
+        # something is going wrong upstream...
+
+        # hack for now
+        if isinstance(event, pandas.DataFrame):
+            return
+
         if(event.dt >= self.market_close):
             self.handle_market_close()