diff --git a/DataScience/ActionSetVisualization.py b/DataScience/ActionSetVisualization.py
index fb91adcf..1d411818 100644
--- a/DataScience/ActionSetVisualization.py
+++ b/DataScience/ActionSetVisualization.py
@@ -21,7 +21,7 @@ def update(files, dt_str=13):
         
             if x.startswith(b'{"_label') and x.strip().endswith(b'}'):
                 data = ds_parse.json_cooked(x)
-                if data['a'] <= 0:
+                if data is None:
                     continue
                 
                 c_imp_all.update([data['ts'][:dt_str]])
diff --git a/DataScience/LogDownloader.py b/DataScience/LogDownloader.py
index db549ac7..6281c210 100644
--- a/DataScience/LogDownloader.py
+++ b/DataScience/LogDownloader.py
@@ -322,7 +322,7 @@ def download_container(app_id, log_dir, container=None, conn_string=None, accoun
                                 for x in open(fn, 'rb'):
                                     if x.startswith(b'{"_label_cost') and x.strip().endswith(b'}'):     # reading only cooked lined
                                         data = ds_parse.json_cooked(x)
-                                        if data['ei'] not in d or float(data['cost']) < d[data['ei']][1]: # taking line with best reward
+                                        if data is not None and (data['ei'] not in d or float(data['cost']) < d[data['ei']][1]): # taking line with best reward
                                             d[data['ei']] = (data['ts'], float(data['cost']), x)
                             print(' - len(d): {}'.format(len(d)))
 
diff --git a/DataScience/RankRewardAnalyzer.py b/DataScience/RankRewardAnalyzer.py
index 436d10b0..cb7e0c5f 100644
--- a/DataScience/RankRewardAnalyzer.py
+++ b/DataScience/RankRewardAnalyzer.py
@@ -122,6 +122,8 @@ def print_stats(local_fp, azure_path, verbose=False, plot_hist=False, hist_bin=1
 
             if x.startswith(b'{"_label_cost":'):
                 data = ds_parse.json_cooked(x)
+                if data is None:
+                    continue
                 ei = str(data['ei'], 'utf-8')
                 c = str(data['cost'], 'utf-8')
                 azure_data.append((ei, c))
diff --git a/DataScience/dashboard_utils.py b/DataScience/dashboard_utils.py
index 9674fd8d..2e58393e 100644
--- a/DataScience/dashboard_utils.py
+++ b/DataScience/dashboard_utils.py
@@ -144,8 +144,8 @@ def create_stats(log_fp, d=None, predictions_files=None):
         if x.startswith(b'{"_label_cost":') and x.strip().endswith(b'}'):
             data = ds_parse.json_cooked(x)
 
-            # Skip not activated lines or wrongly formated lines
-            if data['skipLearn'] or data['p'] < 1e-10 or data['num_a'] < 1 or data['a'] < 1:
+            # Skip wrongly formated lines or not activated lines
+            if data is None or data['skipLearn']:
                 continue
 
             if data['cost'] == b'0':
diff --git a/DataScience/ds_parse.py b/DataScience/ds_parse.py
index 73a490c7..a23493cf 100644
--- a/DataScience/ds_parse.py
+++ b/DataScience/ds_parse.py
@@ -58,11 +58,14 @@ def process_dsjson_file(fp, d=None, e=None):
                 continue
 
             if not (x.startswith(b'{"') and x.strip().endswith(b'}')):
-                print('Corrupted line: {}'.format(x))
+                print('Skipping corrupted line {}: Missing brackets \{ \}'.format(i))
                 continue
             
             if x.startswith(b'{"_label_cost":'):
                 data = json_cooked(x)
+                if data is None:
+                    print('Skipping corrupted line {}: data is None'.format(i))
+                    continue
 
                 if data['skipLearn']:    # Ignore not activated lines
                     not_activated += 1
@@ -77,8 +80,6 @@ def process_dsjson_file(fp, d=None, e=None):
                     stats[data['a']] = [0,0,0,0,0,0]
 
                 stats[data['a']][5] += 1
-                if data['p'] <= 0:
-                    continue
 
                 stats[data['a']][4] += 1/data['p']
                 baselineRandom[1] += 1/data['p']/data['num_a']
@@ -145,7 +146,9 @@ def json_cooked(x, do_devType=False, do_VWState=False, do_p_vec=False):
         ind5 = ind4+13                  # len('","EventId":"') = 13
     ind6 = x.find(b'"',ind5)
     ind7 = x.find(b',"a"',ind5)
-    ind8 = x.find(b']',ind7+7)          # equal to: x.find('],"c',ind7+8)
+    ind8 = x.find(b'],"c"',ind7+7)
+    if ind8 == -1:
+        return None
 
     data = {}
     data['o'] = 1 if b',"o":' in x[ind2+30:ind2+50] else 0
@@ -157,7 +160,10 @@ def json_cooked(x, do_devType=False, do_VWState=False, do_p_vec=False):
     data['a'] = int(data['a_vec'][0])
     data['num_a'] = len(data['a_vec'])
     data['skipLearn'] = b'"_skipLearn":true' in x[ind2+34:ind3] # len('"_label_Action":1,"_labelIndex":0,') = 34
-    
+
+    if data['p'] < 1e-10 or data['a'] < 1 or data['num_a'] < 1:
+        return None
+
     if do_VWState:
         ind11 = x[-120:].find(b'VWState')
         data['model_id'] = x[-120+ind11+15:-4] if ind11 > -1 else b'N/A'