Index: zabbix-3.4.12-1+buster/src/zabbix_server/server.c
===================================================================
--- zabbix-3.4.12-1+buster.orig/src/zabbix_server/server.c
+++ zabbix-3.4.12-1+buster/src/zabbix_server/server.c
@@ -176,6 +176,8 @@ int	CONFIG_HOUSEKEEPING_FREQUENCY	= 1;
 int	CONFIG_MAX_HOUSEKEEPER_DELETE	= 5000;		/* applies for every separate field value */
 int	CONFIG_HISTSYNCER_FORKS		= 4;
 int	CONFIG_HISTSYNCER_FREQUENCY	= 1;
+int	CONFIG_HISTSYNCER_GRACE_PERIOD	= 0;
+
 int	CONFIG_CONFSYNCER_FORKS		= 1;
 int	CONFIG_CONFSYNCER_FREQUENCY	= 60;
 
@@ -556,6 +558,8 @@ static void	zbx_load_config(ZBX_TASK_EX
 			MANDATORY,	MIN,			MAX */
 		{"StartDBSyncers",		&CONFIG_HISTSYNCER_FORKS,		TYPE_INT,
 			PARM_OPT,	1,			100},
+		{"DBSyncersGracePeriod",	&CONFIG_HISTSYNCER_GRACE_PERIOD,	TYPE_INT,
+			PARM_OPT,	0,			SEC_PER_DAY},
 		{"StartDiscoverers",		&CONFIG_DISCOVERER_FORKS,		TYPE_INT,
 			PARM_OPT,	0,			250},
 		{"StartHTTPPollers",		&CONFIG_HTTPPOLLER_FORKS,		TYPE_INT,
Index: zabbix-3.4.12-1+buster/src/zabbix_proxy/proxy.c
===================================================================
--- zabbix-3.4.12-1+buster.orig/src/zabbix_proxy/proxy.c
+++ zabbix-3.4.12-1+buster/src/zabbix_proxy/proxy.c
@@ -173,6 +173,7 @@ int	CONFIG_PROXYDATA_FREQUENCY	= 1;
 
 int	CONFIG_HISTSYNCER_FORKS		= 4;
 int	CONFIG_HISTSYNCER_FREQUENCY	= 1;
+int	CONFIG_HISTSYNCER_GRACE_PERIOD	= 0;
 int	CONFIG_CONFSYNCER_FORKS		= 1;
 
 int	CONFIG_VMWARE_FORKS		= 0;
Index: zabbix-3.4.12-1+buster/src/libs/zbxhistory/history.c
===================================================================
--- zabbix-3.4.12-1+buster.orig/src/libs/zbxhistory/history.c
+++ zabbix-3.4.12-1+buster/src/libs/zbxhistory/history.c
@@ -34,6 +34,9 @@ extern char	*CONFIG_HISTORY_STR_STORAGE;
 extern char	*CONFIG_HISTORY_TEXT_STORAGE;
 extern char	*CONFIG_HISTORY_LOG_STORAGE;
 
+extern int	CONFIG_SERVER_STARTUP_TIME;
+extern int	CONFIG_HISTSYNCER_GRACE_PERIOD;
+
 zbx_history_iface_t	history_ifaces[ITEM_VALUE_TYPE_MAX];
 
 /************************************************************************************
@@ -162,6 +165,12 @@ int	zbx_history_get_values(zbx_uint64_t
 	int			ret, pos;
 	zbx_history_iface_t	*writer = &history_ifaces[value_type];
 
+	if (time(NULL) - CONFIG_SERVER_STARTUP_TIME < CONFIG_HISTSYNCER_GRACE_PERIOD)
+	{
+		zabbix_log(LOG_LEVEL_DEBUG, "waiting for cache load, exiting");
+		return FAIL;
+	}
+
 	zabbix_log(LOG_LEVEL_DEBUG, "In %s() itemid:" ZBX_FS_UI64 " value_type:%d start:%d count:%d end:%d",
 			__function_name, itemid, value_type, start, count, end);
 
Index: zabbix-3.4.12-1+buster/conf/zabbix_server.conf
===================================================================
--- zabbix-3.4.12-1+buster.orig/conf/zabbix_server.conf
+++ zabbix-3.4.12-1+buster/conf/zabbix_server.conf
@@ -413,6 +413,14 @@ DBUser=zabbix
 # Default:
 # StartDBSyncers=4
 
+### Option: DBSyncersGracePeriod
+#       Time after server startup, during which reading from history storage will be prohibited.
+#
+# Mandatory: no
+# Range: 0-86400
+# Default:
+# DBSyncersGracePeriod=0
+
 ### Option: HistoryCacheSize
 #	Size of history cache, in bytes.
 #	Shared memory size for storing history data.