diff --git a/lib/virtual.js b/lib/virtual.js
index 4e43fb0b..201e4cd3 100644
--- a/lib/virtual.js
+++ b/lib/virtual.js
@@ -158,29 +158,27 @@ VirtualModulesPlugin.prototype.writeModule = function(filePath, contents) {
 	}
 };
 
+function getStorageData(storage) {
+	return storage._data /* webpack 5 */ || storage.data /* webpack 4 */;
+}
+
 function getData(storage, key) {
-	const data = storage._data /* webpack 5 */ || storage.data /* webpack 4 */;
-	if (data instanceof Map) {
-		return storage.data.get(key);
+	const storageData = getStorageData(storage);
+	if (storageData instanceof Map) {
+		return storageData.get(key);
+	} else {
+		return storageData.data[key];
 	}
-	return data.data[key];
 }
 
-function setData(backendOrStorage, key, valueFactory) {
+function setData(storage, key, valueFactory) {
+	const storageData = getStorageData(storage);
 	const value = valueFactory(backendOrStorage);
 
-	// Webpack v5
-	if (backendOrStorage._data instanceof Map) {
-		backendOrStorage._data.set(key, value);
-	} else if (backendOrStorage._data) {
-		backendOrStorage.data[key] = value;
-	} else if (backendOrStorage.data instanceof Map) {
-		// Webpack 4
-		backendOrStorage.data.set(key, value);
-		backendOrStorage.data.set(key, value);
+	if (storageData instanceof Map) {
+		storageData.set(key, value);
 	} else {
-		backendOrStorage.data[key] = value;
-		backendOrStorage.data[key] = value;
+		storageData.data[key] = value;
 	}
 }