diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpLitMaterialExporter.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpLitMaterialExporter.cs
index 2fca9ea28..3ae4807ee 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpLitMaterialExporter.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpLitMaterialExporter.cs
@@ -25,7 +25,7 @@ namespace UniGLTF
             {
                 if (src == null) throw new ArgumentNullException(nameof(src));
                 if (textureExporter == null) throw new ArgumentNullException(nameof(textureExporter));
-                if (src.shader != Shader) throw new UniGLTFShaderNotMatchedInternalException(src.shader);
+                if (src.shader != Shader || Shader == null) throw new UniGLTFShaderNotMatchedInternalException(src.shader);
 
                 dst = new glTFMaterial
                 {
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpUniUnlitMaterialExporter.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpUniUnlitMaterialExporter.cs
index 8f68209a4..05670b81a 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpUniUnlitMaterialExporter.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpUniUnlitMaterialExporter.cs
@@ -24,7 +24,7 @@ namespace UniGLTF
             {
                 if (src == null) throw new ArgumentNullException(nameof(src));
                 if (textureExporter == null) throw new ArgumentNullException(nameof(textureExporter));
-                if (src.shader != Shader) throw new UniGLTFShaderNotMatchedInternalException(src.shader);
+                if (src.shader != Shader || Shader == null) throw new UniGLTFShaderNotMatchedInternalException(src.shader);
 
                 dst = glTF_KHR_materials_unlit.CreateDefault();
                 dst.name = src.name;
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpUnlitMaterialExporter.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpUnlitMaterialExporter.cs
index df8523d8c..67659c474 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpUnlitMaterialExporter.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/MaterialIO/URP/Export/Materials/UrpUnlitMaterialExporter.cs
@@ -23,7 +23,7 @@ namespace UniGLTF
             {
                 if (src == null) throw new ArgumentNullException(nameof(src));
                 if (textureExporter == null) throw new ArgumentNullException(nameof(textureExporter));
-                if (src.shader != Shader) throw new UniGLTFShaderNotMatchedInternalException(src.shader);
+                if (src.shader != Shader || Shader == null) throw new UniGLTFShaderNotMatchedInternalException(src.shader);
 
                 dst = glTF_KHR_materials_unlit.CreateDefault();
                 dst.name = src.name;