diff --git a/ext/bscacquisition.py b/ext/bscacquisition.py
index 06774d9..c1bdd02 100644
--- a/ext/bscacquisition.py
+++ b/ext/bscacquisition.py
@@ -21,9 +21,7 @@ class BSCAcquisition(Acquisition):
         self.bscache.flush()
         data = []
         for i in range(n_pulses):
-            #print('Requested %i' % i)
             data.append(next(self.bscache))
-            #print('Received %i' % i)
 
         # write out the data file
         use_channels = self.use_channels or self.bscache.channels.keys()
@@ -33,7 +31,12 @@ class BSCAcquisition(Acquisition):
             pidname = 'pulse_id/group%d' % self.grp
             hid.create_dataset(pidname, data=singledata)
             for chn in use_channels:
-                singledata = [ele[chn] for ele in data]
+                singledata = []
+                for ele in data:
+                    if chn in ele:
+                        singledata.append(ele[chn])
+                    else:
+                        print('%s not in data!' % chn)
                 if not chn == 'pid':
                     dname = chn.replace(':','/')+'/data'
                     hid.create_dataset(dname, data=singledata)