diff --git a/daemon/rule/operator.go b/daemon/rule/operator.go
index d4cbc14d..193271d3 100644
--- a/daemon/rule/operator.go
+++ b/daemon/rule/operator.go
@@ -46,7 +46,7 @@ type Operator struct {
 	re *regexp.Regexp
 }
 
-func NewOperator(t Type, o Operand, data string, list []Operator) *Operator {
+func NewOperator(t Type, o Operand, data string, list []Operator) (*Operator, error) {
 	op := Operator{
 		Type:    t,
 		Operand: o,
@@ -54,9 +54,10 @@ func NewOperator(t Type, o Operand, data string, list []Operator) *Operator {
 		List:    list,
 	}
 	if err := op.Compile(); err != nil {
-		return nil
+		log.Error("NewOperator() failed to compile:", err)
+		return nil, err
 	}
-	return &op
+	return &op, nil
 }
 
 func (o *Operator) Compile() error {
@@ -64,11 +65,11 @@ func (o *Operator) Compile() error {
 		o.cb = o.simpleCmp
 	} else if o.Type == Regexp {
 		o.cb = o.reCmp
-		if re, err := regexp.Compile(o.Data); err == nil {
-			o.re = re
-		} else {
+		re, err := regexp.Compile(o.Data)
+		if err != nil {
 			return err
 		}
+		o.re = re
 	} else if o.Type == List {
 		o.Operand = OpList
 	}
diff --git a/daemon/rule/rule.go b/daemon/rule/rule.go
index ccb6c68a..df257592 100644
--- a/daemon/rule/rule.go
+++ b/daemon/rule/rule.go
@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"github.com/gustavo-iniguez-goya/opensnitch/daemon/conman"
+	"github.com/gustavo-iniguez-goya/opensnitch/daemon/log"
 	"github.com/gustavo-iniguez-goya/opensnitch/daemon/ui/protocol"
 )
 
@@ -59,18 +60,20 @@ func (r *Rule) Match(con *conman.Connection) bool {
 	return r.Operator.Match(con)
 }
 
-func Deserialize(reply *protocol.Rule) *Rule {
+func Deserialize(reply *protocol.Rule) (*Rule, error) {
 	if reply.Operator == nil {
-		return nil
+		log.Warning("Deserialize rule, Operator nil")
+		return nil, fmt.Errorf("invalid operator")
 	}
-	operator := NewOperator(
+	operator, err := NewOperator(
 		Type(reply.Operator.Type),
 		Operand(reply.Operator.Operand),
 		reply.Operator.Data,
 		make([]Operator, 0),
 	)
-	if operator == nil {
-		return nil
+	if err != nil {
+		log.Warning("Deserialize rule, NewOperator() error:", err)
+		return nil, err
 	}
 
 	return Create(
@@ -79,7 +82,7 @@ func Deserialize(reply *protocol.Rule) *Rule {
 		Action(reply.Action),
 		Duration(reply.Duration),
 		operator,
-	)
+	), nil
 }
 
 func (r *Rule) Serialize() *protocol.Rule {
diff --git a/daemon/ui/client.go b/daemon/ui/client.go
index dd15ba54..0b66a686 100644
--- a/daemon/ui/client.go
+++ b/daemon/ui/client.go
@@ -21,8 +21,9 @@ import (
 
 var (
 	configFile             = "/etc/opensnitchd/default-config.json"
-	clientDisconnectedRule = rule.Create("ui.client.disconnected", true, rule.Allow, rule.Once, rule.NewOperator(rule.Simple, rule.OpTrue, "", make([]rule.Operator, 0)))
-	clientErrorRule        = rule.Create("ui.client.error", true, rule.Allow, rule.Once, rule.NewOperator(rule.Simple, rule.OpTrue, "", make([]rule.Operator, 0)))
+	dummyOperator, _       = rule.NewOperator(rule.Simple, rule.OpTrue, "", make([]rule.Operator, 0))
+	clientDisconnectedRule = rule.Create("ui.client.disconnected", true, rule.Allow, rule.Once, dummyOperator)
+	clientErrorRule        = rule.Create("ui.client.error", true, rule.Allow, rule.Once, dummyOperator)
 	config                 Config
 )
 
@@ -234,7 +235,11 @@ func (c *Client) Ask(con *conman.Connection) (*rule.Rule, bool) {
 		return nil, false
 	}
 
-	return rule.Deserialize(reply), true
+	r, err := rule.Deserialize(reply)
+	if err != nil {
+		return nil, false
+	}
+	return r, true
 }
 
 func (c *Client) monitorConfigWorker() {
diff --git a/daemon/ui/notifications.go b/daemon/ui/notifications.go
index 83b872ea..9bdbeea2 100644
--- a/daemon/ui/notifications.go
+++ b/daemon/ui/notifications.go
@@ -77,7 +77,7 @@ func (c *Client) handleNotification(stream protocol.UI_NotificationsClient, noti
 		for _, rul := range notification.Rules {
 			log.Info("[notification] enable rule: ", rul.Name)
 			// protocol.Rule(protobuf) != rule.Rule(json)
-			r := rule.Deserialize(rul)
+			r, _ := rule.Deserialize(rul)
 			r.Enabled = true
 			// save to disk only if the duration is rule.Always
 			if err := c.rules.Replace(r, r.Duration == rule.Always); err != nil {
@@ -90,7 +90,7 @@ func (c *Client) handleNotification(stream protocol.UI_NotificationsClient, noti
 		var rErr error
 		for _, rul := range notification.Rules {
 			log.Info("[notification] disable: ", rul)
-			r := rule.Deserialize(rul)
+			r, _ := rule.Deserialize(rul)
 			r.Enabled = false
 			if err := c.rules.Replace(r, r.Duration == rule.Always); err != nil {
 				rErr = err
@@ -113,9 +113,10 @@ func (c *Client) handleNotification(stream protocol.UI_NotificationsClient, noti
 	case notification.Type == protocol.Action_CHANGE_RULE:
 		var rErr error
 		for _, rul := range notification.Rules {
-			r := rule.Deserialize(rul)
+			log.Info("CHANGE_RULE: ", rul)
+			r, err := rule.Deserialize(rul)
 			if r == nil {
-				rErr = fmt.Errorf("Invalid rule")
+				rErr = fmt.Errorf("Invalid rule, %s", err)
 				continue
 			}
 			log.Info("[notification] change rule: ", r, notification.Id)