diff --git a/diff.go b/diff.go
index f7e1b84..8ac8bd0 100644
--- a/diff.go
+++ b/diff.go
@@ -227,6 +227,10 @@ func tagName(tag string, f reflect.StructField) string {
 }
 
 func identifier(tag string, v reflect.Value) interface{} {
+	if v.Kind() != reflect.Struct {
+		return nil
+	}
+
 	for i := 0; i < v.NumField(); i++ {
 		if hasTagOption(tag, v.Type().Field(i), "identifier") {
 			return v.Field(i).Interface()
diff --git a/diff_examples_test.go b/diff_examples_test.go
index 2885eb7..e43c29d 100644
--- a/diff_examples_test.go
+++ b/diff_examples_test.go
@@ -312,7 +312,7 @@ func ExampleComplexSlicePatch() {
 
 	fmt.Printf("Patched %d entries and encountered %d errors", len(patchLog), patchLog.ErrorCount())
 
-	//Output: Patched 7 entries and encountered 4 errors
+	//Output: Patched 7 entries and encountered 3 errors
 }
 
 //ExampleComplexMapPatch demonstrates how to use the Patch function for complex slices.