diff --git a/agents/radagent.go b/agents/radagent.go
index 88b22f6b2..c2d343d24 100644
--- a/agents/radagent.go
+++ b/agents/radagent.go
@@ -534,6 +534,9 @@ func (ra *RadiusAgent) V1AlterSessions(_ *context.Context, cgrEv utils.CGREvent,
 	if optTpl, err := cgrEv.OptAsString(utils.MetaRadCoATemplate); err == nil {
 		coaTpl = optTpl
 	}
+	if _, found := ra.cgrCfg.TemplatesCfg()[coaTpl]; !found {
+		return fmt.Errorf("%w: CoA Template %s", utils.ErrNotFound, coaTpl)
+	}
 
 	replyCode, err := ra.sendRadDaReq(radigo.CoARequest, coaTpl,
 		originID, utils.MapStorage(cgrEv.Event), nil)
diff --git a/config/configsanity.go b/config/configsanity.go
index ce1d91f19..28831c60e 100644
--- a/config/configsanity.go
+++ b/config/configsanity.go
@@ -373,6 +373,16 @@ func (cfg *CGRConfig) checkConfigSanity() error {
 	}
 	//Radius Agent
 	if cfg.radiusAgentCfg.Enabled {
+		if cfg.radiusAgentCfg.CoATemplate != "" {
+			if _, found := cfg.templates[cfg.radiusAgentCfg.CoATemplate]; !found {
+				return fmt.Errorf("<%s> CoA Template %s not defined", utils.RadiusAgent, cfg.radiusAgentCfg.CoATemplate)
+			}
+		}
+		if cfg.radiusAgentCfg.DMRTemplate != "" {
+			if _, found := cfg.templates[cfg.radiusAgentCfg.DMRTemplate]; !found {
+				return fmt.Errorf("<%s> DMR Template %s not defined", utils.RadiusAgent, cfg.radiusAgentCfg.DMRTemplate)
+			}
+		}
 		for _, connID := range cfg.radiusAgentCfg.SessionSConns {
 			if strings.HasPrefix(connID, utils.MetaInternal) && !cfg.sessionSCfg.Enabled {
 				return fmt.Errorf("<%s> not enabled but requested by <%s> component", utils.SessionS, utils.RadiusAgent)
diff --git a/config/configsanity_test.go b/config/configsanity_test.go
index 067150d4d..7df227b9a 100644
--- a/config/configsanity_test.go
+++ b/config/configsanity_test.go
@@ -608,8 +608,22 @@ func TestConfigSanityRadiusAgent(t *testing.T) {
 		},
 	}
 
+	cfg.radiusAgentCfg.CoATemplate = "test_coa" // point to non-existent template
+	expected := "<RadiusAgent> CoA Template test_coa not defined"
+	if err := cfg.checkConfigSanity(); err == nil || err.Error() != expected {
+		t.Errorf("expected %v, received %v", expected, err)
+	}
+	cfg.radiusAgentCfg.CoATemplate = "*coa" // point to default CoA template
+
+	cfg.radiusAgentCfg.DMRTemplate = "test_dmr" // point to non-existent template
+	expected = "<RadiusAgent> DMR Template test_dmr not defined"
+	if err := cfg.checkConfigSanity(); err == nil || err.Error() != expected {
+		t.Errorf("expected %v, received %v", expected, err)
+	}
+	cfg.radiusAgentCfg.DMRTemplate = "*dmr" // point to default DMR template
+
 	cfg.radiusAgentCfg.SessionSConns = []string{utils.ConcatenatedKey(utils.MetaInternal, utils.MetaSessionS)}
-	expected := "<SessionS> not enabled but requested by <RadiusAgent> component"
+	expected = "<SessionS> not enabled but requested by <RadiusAgent> component"
 	if err := cfg.checkConfigSanity(); err == nil || err.Error() != expected {
 		t.Errorf("Expecting: %+q  received: %+q", expected, err)
 	}
@@ -683,6 +697,15 @@ func TestConfigSanityRadiusAgent(t *testing.T) {
 		t.Errorf("Expecting: %+q  received: %+q", expected, err)
 	}
 	cfg.radiusAgentCfg.RequestProcessors[0].Filters = []string{"*string:~*req.Account:1001"}
+	if err := cfg.checkConfigSanity(); err != nil {
+		t.Error(err)
+	}
+
+	cfg.radiusAgentCfg.CoATemplate = ""
+	cfg.radiusAgentCfg.DMRTemplate = ""
+	if err := cfg.checkConfigSanity(); err != nil {
+		t.Error(err)
+	}
 }
 
 func TestConfigSanityDNSAgent(t *testing.T) {
diff --git a/data/conf/samples/radius_coa_disconnect/templates.json b/data/conf/samples/radius_coa_disconnect/templates.json
index d334a2408..8bdad5d9c 100644
--- a/data/conf/samples/radius_coa_disconnect/templates.json
+++ b/data/conf/samples/radius_coa_disconnect/templates.json
@@ -11,7 +11,7 @@
 		{"tag": "Acct-Session-Id", "path": "*radDAReq.Acct-Session-Id", "type": "*variable", 
 			"value": "~*oreq.Acct-Session-Id"},
 		{"tag": "Filter-Id", "path": "*radDAReq.Filter-Id", "type": "*variable", 
-			"value": "~*req.CustomFilter"},
+			"value": "~*req.CustomFilter"}
 	]
 }