diff --git a/engine/ips.go b/engine/ips.go
index 8dd8547b3..6a5faa487 100644
--- a/engine/ips.go
+++ b/engine/ips.go
@@ -104,8 +104,9 @@ func (ip *IPProfile) unlock() {
 	if ip.lkID == utils.EmptyString {
 		return
 	}
-	guardian.Guardian.UnguardIDs(ip.lkID)
+	tmp := ip.lkID
 	ip.lkID = utils.EmptyString
+	guardian.Guardian.UnguardIDs(tmp)
 }
 
 // IPUsage represents an usage counted.
@@ -206,8 +207,10 @@ func (ip *IP) unlock() {
 	if ip.lkID == utils.EmptyString {
 		return
 	}
-	guardian.Guardian.UnguardIDs(ip.lkID)
+	tmp := ip.lkID
 	ip.lkID = utils.EmptyString
+	guardian.Guardian.UnguardIDs(tmp)
+
 }
 
 type IPWithAPIOpts struct {
diff --git a/engine/libstats.go b/engine/libstats.go
index b3a482b24..5b6c14d82 100644
--- a/engine/libstats.go
+++ b/engine/libstats.go
@@ -119,8 +119,9 @@ func (sqp *StatQueueProfile) unlock() {
 	if sqp.lkID == utils.EmptyString {
 		return
 	}
-	guardian.Guardian.UnguardIDs(sqp.lkID)
+	tmp := sqp.lkID
 	sqp.lkID = utils.EmptyString
+	guardian.Guardian.UnguardIDs(tmp)
 }
 
 // isLocked returns the locks status of this StatQueueProfile
@@ -320,8 +321,10 @@ func (sq *StatQueue) unlock() {
 	if sq.lkID == utils.EmptyString {
 		return
 	}
-	guardian.Guardian.UnguardIDs(sq.lkID)
+	tmp := sq.lkID
 	sq.lkID = utils.EmptyString
+	guardian.Guardian.UnguardIDs(tmp)
+
 }
 
 // isLocked returns the locks status of this StatQueue
diff --git a/engine/resources.go b/engine/resources.go
index 9f6d8a754..af19b46f4 100644
--- a/engine/resources.go
+++ b/engine/resources.go
@@ -114,8 +114,10 @@ func (rp *ResourceProfile) unlock() {
 	if rp.lkID == utils.EmptyString {
 		return
 	}
-	guardian.Guardian.UnguardIDs(rp.lkID)
+	tmp := rp.lkID
 	rp.lkID = utils.EmptyString
+	guardian.Guardian.UnguardIDs(tmp)
+
 }
 
 // isLocked returns the locks status of this resourceProfile
@@ -228,8 +230,9 @@ func (r *Resource) unlock() {
 	if r.lkID == utils.EmptyString {
 		return
 	}
-	guardian.Guardian.UnguardIDs(r.lkID)
+	tmp := r.lkID
 	r.lkID = utils.EmptyString
+	guardian.Guardian.UnguardIDs(tmp)
 }
 
 // isLocked returns the locks status of this resource
diff --git a/engine/thresholds.go b/engine/thresholds.go
index cb5c07caa..86a53dd66 100644
--- a/engine/thresholds.go
+++ b/engine/thresholds.go
@@ -117,8 +117,9 @@ func (tp *ThresholdProfile) unlock() {
 	if tp.lkID == utils.EmptyString {
 		return
 	}
-	guardian.Guardian.UnguardIDs(tp.lkID)
+	tmp := tp.lkID
 	tp.lkID = utils.EmptyString
+	guardian.Guardian.UnguardIDs(tmp)
 }
 
 // isLocked returns the locks status of this ThresholdProfile
@@ -209,8 +210,9 @@ func (t *Threshold) unlock() {
 	if t.lkID == utils.EmptyString {
 		return
 	}
-	guardian.Guardian.UnguardIDs(t.lkID)
+	tmp := t.lkID
 	t.lkID = utils.EmptyString
+	guardian.Guardian.UnguardIDs(tmp)
 }
 
 // isLocked returns the locks status of this threshold