diff --git a/openquake/qa_tests_data/event_based_risk/reinsurance_5/expected/reinsurance-aggcurves.csv b/openquake/qa_tests_data/event_based_risk/reinsurance_5/expected/reinsurance-aggcurves.csv
index 0d0e884c97d2..cb44f7eb5159 100644
--- a/openquake/qa_tests_data/event_based_risk/reinsurance_5/expected/reinsurance-aggcurves.csv
+++ b/openquake/qa_tests_data/event_based_risk/reinsurance_5/expected/reinsurance-aggcurves.csv
@@ -1,5 +1,6 @@
-#,,,"generated_by='OpenQuake engine 3.18.0-git00abdf97f8', start_date='2023-09-18T09:11:45', checksum=1056964987"
+#,,,"generated_by='OpenQuake engine 3.18.0-git9ab8269ea3', start_date='2023-09-25T07:31:13', checksum=1718747518"
 rlz_id,return_period,retention,claim
-0,5.00000E+01,0.00000E+00,0.00000E+00
-0,1.00000E+02,1.07555E+02,1.07555E+02
-0,2.00000E+02,6.33285E+02,6.33285E+02
+0,5.00000E+01,5.47169E+01,5.47169E+01
+0,1.00000E+02,5.59046E+02,5.59046E+02
+0,2.00000E+02,2.20776E+03,2.20776E+03
+0,5.00000E+02,2.66082E+03,2.66082E+03
diff --git a/openquake/qa_tests_data/event_based_risk/reinsurance_5/job_1.ini b/openquake/qa_tests_data/event_based_risk/reinsurance_5/job_1.ini
index 105d702f4993..14c021c80adf 100644
--- a/openquake/qa_tests_data/event_based_risk/reinsurance_5/job_1.ini
+++ b/openquake/qa_tests_data/event_based_risk/reinsurance_5/job_1.ini
@@ -27,7 +27,7 @@ truncation_level = 3
 maximum_distance = 200.0
 investigation_time = 1
 number_of_logic_tree_samples = 0
-ses_per_logic_tree_path = 200
+ses_per_logic_tree_path = 500
 
 [vulnerability]
 structural_vulnerability_file = structural_vulnerability_model.xml
diff --git a/openquake/qa_tests_data/event_based_risk/reinsurance_5/job_2.ini b/openquake/qa_tests_data/event_based_risk/reinsurance_5/job_2.ini
index 15a29ffa47f6..3ecc8cd4f492 100644
--- a/openquake/qa_tests_data/event_based_risk/reinsurance_5/job_2.ini
+++ b/openquake/qa_tests_data/event_based_risk/reinsurance_5/job_2.ini
@@ -27,7 +27,7 @@ truncation_level = 3
 maximum_distance = 200.0
 investigation_time = 1
 number_of_logic_tree_samples = 0
-ses_per_logic_tree_path = 200
+ses_per_logic_tree_path = 500
 
 [vulnerability]
 structural_vulnerability_file = structural_vulnerability_model.xml
diff --git a/openquake/risklib/reinsurance.py b/openquake/risklib/reinsurance.py
index 0b93d70ac43e..21b1a07f9ed6 100644
--- a/openquake/risklib/reinsurance.py
+++ b/openquake/risklib/reinsurance.py
@@ -56,12 +56,12 @@ def check_fields(fields, dframe, policyidx, fname, policyfname, treaties,
     :param treaty_types: treaty types
     """
     key = fields[0]
-    [indices] = np.where(dframe.deductible.to_numpy() == '')
+    [indices] = np.where(np.isnan(dframe.deductible.to_numpy()))
     if len(indices) > 0:
         raise InvalidFile(
             '%s (rows %s): empty deductible values were found' % (
                 policyfname, [idx + 2 for idx in indices]))
-    [indices] = np.where(dframe.liability.to_numpy() == '')
+    [indices] = np.where(np.isnan(dframe.liability.to_numpy()))
     if len(indices) > 0:
         raise InvalidFile(
             '%s (rows %s): empty liability values were found' % (
@@ -234,8 +234,7 @@ def parse(fname, policy_idx):
         treaty['limit'].append(limit)
         treaty_linenos.append(node.lineno)
     policyfname = os.path.join(os.path.dirname(fname), ~rmodel.policies)
-    df = pd.read_csv(policyfname, keep_default_na=False).rename(
-        columns=fieldmap)
+    df = pd.read_csv(policyfname).rename(columns=fieldmap)
     df.columns = df.columns.str.strip()
     all_policies = df.policy.to_numpy()  # ex ['A', 'B']
     exp_policies = np.array(list(policy_idx))  # ex ['?', 'B', 'A']