diff --git a/source/gs-texture.cpp b/source/gs-texture.cpp
index ebc27e9..ca9725b 100644
--- a/source/gs-texture.cpp
+++ b/source/gs-texture.cpp
@@ -40,8 +40,8 @@ gs::texture::texture(uint32_t width, uint32_t height, gs_color_format format, ui
 		throw std::logic_error("height must be at least 1");
 	if (mip_levels == 0)
 		throw std::logic_error("mip_levels must be at least 1");
-	//if (!mip_data)
-	//	throw std::logic_error("mip_data is invalid");
+	if (!mip_data)
+		throw std::logic_error("mip_data is invalid");
 
 	if (mip_levels > 1 || ((texture_flags & flags::BuildMipMaps) == flags::BuildMipMaps)) {
 		bool isPOT = util::math::is_power_of_two(width) && util::math::is_power_of_two(height);