Merge pull request #1365 from sosukesuzuki/check-for-namespace

fix: check if the `plugin.constructor` exists

Author: SaltyAom

src/index.ts

@@ -4004,7 +4004,7 @@ export default class Elysia<
 						if (plugin instanceof Elysia)
 							return this._use(plugin).compile()
 
-						if (plugin.constructor.name === 'Elysia')
+						if (plugin.constructor?.name === 'Elysia')
 							return this._use(
 								plugin as unknown as Elysia
 							).compile()
@@ -4015,10 +4015,10 @@ export default class Elysia<
 						if (plugin.default instanceof Elysia)
 							return this._use(plugin.default)
 
-						if (plugin.constructor.name === 'Elysia')
+						if (plugin.constructor?.name === 'Elysia')
 							return this._use(plugin.default)
 
-						if (plugin.constructor.name === '_Elysia')
+						if (plugin.constructor?.name === '_Elysia')
 							return this._use(plugin.default)
 
 						try {