diff --git a/src/features/phone_esm/straw/process_user_event_related_segments.py b/src/features/phone_esm/straw/process_user_event_related_segments.py
index 788d99ec..eae6fab3 100644
--- a/src/features/phone_esm/straw/process_user_event_related_segments.py
+++ b/src/features/phone_esm/straw/process_user_event_related_segments.py
@@ -84,7 +84,7 @@ def extract_ers(esm_df, device_id):
                                      .join(se_intensity, on=['device_id', 'esm_session'], how='inner')
                             
         # Filter sessions that are not useful
-        extracted_ers = extracted_ers[(extracted_ers.se_time != "0 - Ne spomnim se") & (extracted_ers.se_duration != "0 - Ne spomnim se")]
+        extracted_ers = extracted_ers[(~extracted_ers.se_time.str.startswith("0 - ")) & (~extracted_ers.se_duration.str.startswith("0 - "))]
 
         # Transform data into its final form, ready for the extraction
         extracted_ers.reset_index(inplace=True)
@@ -95,7 +95,7 @@ def extract_ers(esm_df, device_id):
 
         extracted_ers['se_duration'] = \
             np.where(
-                extracted_ers['se_duration'] == "1 - Še vedno traja", 
+                extracted_ers['se_duration'].str.startswith("1 - "), 
                 extracted_ers['session_end_timestamp'] - extracted_ers['event_timestamp'], 
                 extracted_ers['se_duration']
             )