diff --git a/tests/bugs/gh_7545_test.py b/tests/bugs/gh_7545_test.py
new file mode 100644
index 00000000..2b4877e0
--- /dev/null
+++ b/tests/bugs/gh_7545_test.py
@@ -0,0 +1,91 @@
+#coding:utf-8
+
+"""
+ID:          issue-7545
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/7545
+TITLE:       Server crash on some LockMemSize values
+DESCRIPTION:
+NOTES:
+    [14.04.2023] pzotov
+    1. One need to be sure that firebird.conf does NOT contain DatabaseAccess = None.
+    2. Test uses pre-created databases.conf which has alias defined by variable REQUIRED_ALIAS.
+       Database file for that alias must NOT exist in the QA_root/files/qa/ subdirectory: it will be created here.
+       Content of databases.conf must be taken from $QA_ROOT/files/qa-databases.conf (one need to replace
+       it before every test session).
+       Discussed with pcisar, letters since 30-may-2022 13:48, subject:
+       "new qa, core_4964_test.py: strange outcome when use... shutil.copy() // comparing to shutil.copy2()"
+    3. Value of REQUIRED_ALIAS must be EXACTLY the same as alias specified in the pre-created databases.conf
+       (for LINUX this equality is case-sensitive, even when aliases are compared!)
+
+    Confirmed crash on 5.0.0.1010, 4.0.3.2923, 3.0.11.33674
+    Checked on 5.0.0.1014, 4.0.3.2929
+"""
+
+import os
+import re
+import locale
+import subprocess
+from pathlib import Path
+import time
+
+import pytest
+from firebird.qa import *
+
+# Name of alias for self-security DB in the QA_root/files/qa-databases.conf.
+# This file must be copied manually to each testing FB homw folder, with replacing
+# databases.conf there:
+#
+REQUIRED_ALIAS = 'tmp_gh_7545_alias'
+
+db = db_factory(do_not_create = True, do_not_drop = True)
+act = python_act('db' , substitutions = [ ('[ \t]+', ' ') ])
+
+@pytest.mark.version('>=3.0.11')
+def test_1(act: Action, capsys):
+    
+    # Scan line-by-line through databases.conf, find line starting with REQUIRED_ALIAS and extract name of file that
+    # must be created in the $(dir_sampleDb)/qa/ folder. This name will be used further as target database (tmp_fdb).
+    # NOTE: we have to SKIP lines which are commented out, i.e. if they starts with '#':
+    p_required_alias_ptn =  re.compile( '^(?!#)((^|\\s+)' + REQUIRED_ALIAS + ')\\s*=\\s*\\$\\(dir_sampleDb\\)/qa/', re.IGNORECASE )
+    fname_in_dbconf = None
+
+    with open(act.home_dir/'databases.conf', 'r') as f:
+        for line in f:
+            if p_required_alias_ptn.search(line):
+                # If databases.conf contains line like this:
+                #     tmp_7545_alias = $(dir_sampleDb)/qa/tmp_gh_7545.fdb
+                # - then we extract filename: 'tmp_gh_7545.fdb' (see below):
+                fname_in_dbconf = Path(line.split('=')[1].strip()).name
+                break
+
+    # if 'fname_in_dbconf' remains undefined here then propably REQUIRED_ALIAS not equals to specified in the databases.conf!
+    #
+    assert fname_in_dbconf
+
+    # Full path + filename of database to which we will try to connect:
+    #
+    tmp_fdb = Path( act.vars['sample_dir'], 'qa', fname_in_dbconf )
+
+    sql_txt = f"""
+        set bail on;
+        set list on;
+        create database 'localhost:{tmp_fdb}';
+        select count(*) from mon$database;
+        commit;
+    """
+
+    expected_stdout_isql = """
+        COUNT 1
+    """
+
+    try:
+        act.expected_stdout = expected_stdout_isql
+        act.isql(switches = ['-q'], input = sql_txt, connect_db=False, combine_output = True, io_enc = locale.getpreferredencoding())
+
+        assert act.clean_stdout == act.clean_expected_stdout
+        act.reset()
+        
+    finally:
+        tmp_fdb.unlink()
+    
+    assert '' == capsys.readouterr().out