diff --git a/lib/CachePlugin.js b/lib/CachePlugin.js
index 0d1650be963..68da003e4a1 100644
--- a/lib/CachePlugin.js
+++ b/lib/CachePlugin.js
@@ -24,21 +24,19 @@ class CachePlugin {
 					compilation.hooks.childCompiler.tap(
 						"CachePlugin",
 						(childCompiler, compilerName, compilerIndex) => {
-							if (cache) {
-								let childCache;
-								if (!cache.children) {
-									cache.children = {};
-								}
-								if (!cache.children[compilerName]) {
-									cache.children[compilerName] = [];
-								}
-								if (cache.children[compilerName][compilerIndex]) {
-									childCache = cache.children[compilerName][compilerIndex];
-								} else {
-									cache.children[compilerName].push((childCache = {}));
-								}
-								registerCacheToCompiler(childCompiler, childCache);
+							let childCache;
+							if (!cache.children) {
+								cache.children = {};
 							}
+							if (!cache.children[compilerName]) {
+								cache.children[compilerName] = [];
+							}
+							if (cache.children[compilerName][compilerIndex]) {
+								childCache = cache.children[compilerName][compilerIndex];
+							} else {
+								cache.children[compilerName].push((childCache = {}));
+							}
+							registerCacheToCompiler(childCompiler, childCache);
 						}
 					);
 				});