Fix error when using named extension after unnamed extension [fix]

overlookmotel · May 18, 2020 · 0a7fc14 · 0a7fc14
1 parent 69442f1
commit 0a7fc14
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/extend.js b/lib/extend.js
@@ -53,7 +53,7 @@ function classExtend(Class, extension) {
 
 		if (name) {
 			namedExtensions = Class[NAMED_EXTENSIONS];
-			const existingExtension = namedExtensions[name];
+			const existingExtension = namedExtensions && namedExtensions[name];
 			if (existingExtension) {
 				if (existingExtension.version !== extension.version) {
 					throw new Error(