diff --git a/adaptercore/resourcemanager/resourcemanager.go b/adaptercore/resourcemanager/resourcemanager.go
index 799a733..b7d7737 100755
--- a/adaptercore/resourcemanager/resourcemanager.go
+++ b/adaptercore/resourcemanager/resourcemanager.go
@@ -354,9 +354,12 @@
 
 // GetONUID returns the available OnuID for the given pon-port
 func (RsrcMgr *OpenOltResourceMgr) GetONUID(ponIntfID uint32) (uint32, error) {
-
+	// Check if Pon Interface ID is present in Resource-manager-map
+	if _, ok := RsrcMgr.ResourceMgrs[ponIntfID]; !ok {
+		err := errors.New("invalid-pon-interface-" + strconv.Itoa(int(ponIntfID)))
+		return 0, err
+	}
 	// Get ONU id for a provided pon interface ID.
-
 	ONUID, err := RsrcMgr.ResourceMgrs[ponIntfID].GetResourceID(ponIntfID,
 		ponrmgr.ONU_ID, 1)
 	if err != nil {