diff --git a/Minecraft.Client/AuthScreen.cpp b/Minecraft.Client/AuthScreen.cpp
index 706d454b..463e07f9 100644
--- a/Minecraft.Client/AuthScreen.cpp
+++ b/Minecraft.Client/AuthScreen.cpp
@@ -28,8 +28,10 @@ void AuthProfileManager::load()
 		auto readWstr = [&file]() -> wstring {
 			uint16_t len = 0;
 			file.read(reinterpret_cast<char *>(&len), sizeof(len));
+			if (!file || len > 4096) return {};
 			wstring s(len, L'\0');
 			file.read(reinterpret_cast<char *>(s.data()), len * sizeof(wchar_t));
+			if (!file) return {};
 			return s;
 		};