diff --git a/storm_analysis/diagnostics/collate.py b/storm_analysis/diagnostics/collate.py
index 236808d8..06c2381e 100644
--- a/storm_analysis/diagnostics/collate.py
+++ b/storm_analysis/diagnostics/collate.py
@@ -97,7 +97,7 @@ def collateDAO(dirs, settings, calc_width_error = True):
                                                measured_h5,
                                                pixel_size = settings.pixel_size,
                                                max_distance = max_distance)
-        if dx is not None:
+        if dx.size != 0:
             all_dx.append([numpy.std(dx), math.sqrt(numpy.mean(dx*dx))])
             all_dy.append([numpy.std(dy), math.sqrt(numpy.mean(dy*dy))])
         else:
@@ -177,14 +177,14 @@ def collateSpliner(dirs, settings):
                                                pixel_size = settings.pixel_size,
                                                max_distance = max_distance)
     
-        if dx is not None:
+        if dx.size != 0:
             all_dx.append([numpy.std(dx), math.sqrt(numpy.mean(dx*dx))])
             all_dy.append([numpy.std(dy), math.sqrt(numpy.mean(dy*dy))])
             all_dz.append([numpy.std(dz), math.sqrt(numpy.mean(dz*dz))])
         else:
-            all_dx.append(0)
-            all_dy.append(0)
-            all_dz.append(0)
+            all_dx.append([0,0])
+            all_dy.append([0,0])
+            all_dz.append([0,0])
 
 
     print()
diff --git a/storm_analysis/diagnostics/spliner/analyze_data.py b/storm_analysis/diagnostics/spliner/analyze_data.py
index d35e7741..94c2abac 100644
--- a/storm_analysis/diagnostics/spliner/analyze_data.py
+++ b/storm_analysis/diagnostics/spliner/analyze_data.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 """
-Analyze test data using Spiner
+Analyze test data using Spliner
 
 Hazen 10/17
 """
diff --git a/storm_analysis/spliner/measure_psf_beads.py b/storm_analysis/spliner/measure_psf_beads.py
index 87fa970d..76043971 100644
--- a/storm_analysis/spliner/measure_psf_beads.py
+++ b/storm_analysis/spliner/measure_psf_beads.py
@@ -96,7 +96,7 @@ def measurePSFBeads(movie_name, zfile_name, beads_file, psf_name, aoi_size = 12,
         # we don't this almost surely means something is wrong.
         if (i == 0):
             for j in range(samples.size):
-                assert(samples[i] > 0), "No data for PSF z section " + str(i)
+                assert(samples[j] > 0), "No data for PSF z section " + str(j)
         
         # Normalize by the number of sample per z section.
         #for j in range(samples.size):