diff --git a/tests/bugs/core_5728_test.py b/tests/bugs/core_5728_test.py
index ce43cbfa..cd16ecf3 100644
--- a/tests/bugs/core_5728_test.py
+++ b/tests/bugs/core_5728_test.py
@@ -5,15 +5,20 @@ ID:          issue-2165
 ISSUE:       2165
 TITLE:       Field subtype of DEC_FIXED columns not returned by isc_info_sql_sub_type
 DESCRIPTION:
-  When requesting the subtype of a NUMERIC or DECIMAL column with precision in [19, 34]
-  using isc_info_sql_sub_type, it always returns 0, instead of 1 for NUMERIC and 2 for DECIMAL.
-NOTES:
-[30.10.2019]
-  Adjusted expected-stdout to current FB, new datatype was introduced: numeric(38).
-[25.06.2020]
-  4.0.0.2076: changed types in SQLDA from numeric to int128 // after discuss with Alex about CORE-6342.
+    When requesting the subtype of a NUMERIC or DECIMAL column with precision in [19, 34]
+    using isc_info_sql_sub_type, it always returns 0, instead of 1 for NUMERIC and 2 for DECIMAL.
 JIRA:        CORE-5728
 FBTEST:      bugs.core_5728
+NOTES:
+    [30.10.2019] pzotov
+        Adjusted expected-stdout to current FB, new datatype was introduced: numeric(38).
+    [25.06.2020] pzotov
+        4.0.0.2076: type in SQLDA was changed from numeric to int128 
+        (adjusted output after discussion with Alex about CORE-6342).
+    [13.12.2023] pzotov
+        Added 'SQLSTATE' in substitutions: runtime error must not be filtered out by '?!(...)' pattern
+        ("negative lookahead assertion", see https://docs.python.org/3/library/re.html#regular-expression-syntax).
+        Added 'combine_output = True' in order to see SQLSTATE if any error occurs.
 """
 
 import pytest
@@ -34,7 +39,7 @@ test_script = """
     select * from test;
 """
 
-act = isql_act('db', test_script, substitutions=[('^((?!sqltype).)*$', ''), ('[ \t]+', ' ')])
+act = isql_act('db', test_script, substitutions=[('^((?!SQLSTATE|sqltype).)*$', ''), ('[ \t]+', ' ')])
 
 expected_stdout = """
     01: sqltype: 32752 INT128 Nullable scale: 0 subtype: 1 len: 16
@@ -46,5 +51,5 @@ expected_stdout = """
 @pytest.mark.version('>=4.0')
 def test_1(act: Action):
     act.expected_stdout = expected_stdout
-    act.execute()
+    act.execute(combine_output = True)
     assert act.clean_stdout == act.clean_expected_stdout