diff --git a/datamodel/high/node_builder.go b/datamodel/high/node_builder.go
index 71b87507..0a71b089 100644
--- a/datamodel/high/node_builder.go
+++ b/datamodel/high/node_builder.go
@@ -627,30 +627,32 @@ func (n *NodeBuilder) extractLowMapKeysWrapped(iu reflect.Value, x string, order
 }
 
 func (n *NodeBuilder) extractLowMapKeys(fg reflect.Value, x string, found bool, orderedCollection []*NodeEntry, m reflect.Value, k reflect.Value) (bool, []*NodeEntry) {
-	for j, ky := range fg.MapKeys() {
-		hu := ky.Interface()
-		if we, wok := hu.(low.HasKeyNode); wok {
-			er := we.GetKeyNode().Value
-			if er == x {
-				found = true
-				orderedCollection = append(orderedCollection, &NodeEntry{
-					Tag:   x,
-					Key:   x,
-					Line:  we.GetKeyNode().Line,
-					Value: m.MapIndex(k).Interface(),
-				})
-			}
-		} else {
-			uu := ky.Interface()
-			if uu == x {
-				// this is a map, without any low level details available
-				found = true
-				orderedCollection = append(orderedCollection, &NodeEntry{
-					Tag:   uu.(string),
-					Key:   uu.(string),
-					Line:  9999 + j,
-					Value: m.MapIndex(k).Interface(),
-				})
+	if !fg.IsZero() {
+		for j, ky := range fg.MapKeys() {
+			hu := ky.Interface()
+			if we, wok := hu.(low.HasKeyNode); wok {
+				er := we.GetKeyNode().Value
+				if er == x {
+					found = true
+					orderedCollection = append(orderedCollection, &NodeEntry{
+						Tag:   x,
+						Key:   x,
+						Line:  we.GetKeyNode().Line,
+						Value: m.MapIndex(k).Interface(),
+					})
+				}
+			} else {
+				uu := ky.Interface()
+				if uu == x {
+					// this is a map, without any low level details available
+					found = true
+					orderedCollection = append(orderedCollection, &NodeEntry{
+						Tag:   uu.(string),
+						Key:   uu.(string),
+						Line:  9999 + j,
+						Value: m.MapIndex(k).Interface(),
+					})
+				}
 			}
 		}
 	}
diff --git a/go.sum b/go.sum
index 026d1375..67087946 100644
--- a/go.sum
+++ b/go.sum
@@ -58,8 +58,6 @@ github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
-github.com/stretchr/testify v1.8.3 h1:RP3t2pwF7cMEbC1dqtB6poj3niw/9gnV4Cjg5oW5gtY=
-github.com/stretchr/testify v1.8.3/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/vmware-labs/yaml-jsonpath v0.3.2 h1:/5QKeCBGdsInyDCyVNLbXyilb61MXGi9NP674f9Hobk=
 github.com/vmware-labs/yaml-jsonpath v0.3.2/go.mod h1:U6whw1z03QyqgWdgXxvVnQ90zN1BWz5V+51Ewf8k+rQ=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
@@ -80,8 +78,6 @@ golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.2.0 h1:PUR+T4wwASmuSTYdKjYHI5TD22Wy5ogLU5qZCOLxBrI=
-golang.org/x/sync v0.2.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=