diff --git a/ChangeLog b/ChangeLog
index aad450a6..2e242c80 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,7 @@ Bug fixes:
 ........S. [ZBX-19872] removed redundant escaping in XML data of HTTP agent POST request (asestakovs)
 ...G...PS. [ZBX-20236] improved memory consumption in Zabbix proxy trappers by moving configuration sync between database and cache to configuration syncer; improved trappers and listeners memory consumption by freeing received data after it was processed instead of after new data is received (vso)
 ...G...... [ZBX-20192] fixed quote expansion in command execution in agent2 on windows (dgoloscapov)
+........S. [ZBX-20249] fixed escalator query failure on Oracle (ssimonenko)
 
 --------------------------------------------------------------------------------
 Changes for 4.4.25
diff --git a/PATCHLIST.md b/PATCHLIST.md
index 2276cbc6..31c38a3b 100644
--- a/PATCHLIST.md
+++ b/PATCHLIST.md
@@ -218,6 +218,7 @@
 [ZBX-20176] fixed trigger not being calculated for first value when item changes state to supported; fixed build failure when DES is disabled in Net-SNMP; fixed tests on big-endian systems (https://support.zabbix.com/browse/ZBX-20076)
 [ZBX-20192] fixed quote expansion in command execution in agent2 on windows (https://support.zabbix.com/browse/ZBX-20192)
 [ZBX-20236] improved memory consumption in Zabbix proxy trappers by moving configuration sync between database and cache to configuration syncer; improved trappers and listeners memory consumption by freeing received data after it was processed instead of after new data is received (https://support.zabbix.com/browse/ZBX-20236)
+[ZBX-20249] fixed escalator query failure on Oracle (https://support.zabbix.com/browse/ZBX-20249)
 [ZBXNEXT-170] implemented possibility to "unlink" specific templates in hosts and templates massupdate (https://support.zabbix.com/browse/ZBXNEXT-170)
 [ZBXNEXT-284] added timeout parameter to zabbix_sender and zabbix_get (https://support.zabbix.com/browse/ZBXNEXT-284)
 [ZBXNEXT-435] Add Oracle TNSNAMES connect support (https://support.zabbix.com/browse/ZBXNEXT-435)
diff --git a/src/zabbix_server/escalator/escalator.c b/src/zabbix_server/escalator/escalator.c
index 5c8c9d10..82b24011 100644
--- a/src/zabbix_server/escalator/escalator.c
+++ b/src/zabbix_server/escalator/escalator.c
@@ -621,15 +621,18 @@ static void	add_sentusers_msg_esc_cancel(ZBX_USER_MSG **user_msg, zbx_uint64_t a
 	zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
 
 	zbx_snprintf_alloc(&sql, &sql_alloc, &sql_offset,
-			"select distinct userid,mediatypeid,subject,message,esc_step"
+			"select userid,mediatypeid,subject,message,esc_step"
 			" from alerts"
-			" where actionid=" ZBX_FS_UI64
-				" and mediatypeid is not null"
-				" and alerttype=%d"
-				" and acknowledgeid is null"
-				" and eventid=" ZBX_FS_UI64
-				" order by userid,mediatypeid,esc_step desc",
-				actionid, ALERT_TYPE_MESSAGE, event->eventid);
+			" where alertid in (select max(alertid)"
+				" from alerts"
+				" where actionid=" ZBX_FS_UI64
+					" and mediatypeid is not null"
+					" and alerttype=%d"
+					" and acknowledgeid is null"
+					" and eventid=" ZBX_FS_UI64
+					" group by userid,mediatypeid,esc_step)"
+			" order by userid,mediatypeid,esc_step desc",
+			actionid, ALERT_TYPE_MESSAGE, event->eventid);
 
 	result = DBselect("%s", sql);