Fix #9326

src/Materials/Node/Blocks/Dual/textureBlock.ts

@@ -430,7 +430,7 @@ export class TextureBlock extends NodeMaterialBlock {
         serializationObject.convertToGammaSpace = this.convertToGammaSpace;
         serializationObject.convertToLinearSpace = this.convertToLinearSpace;
         serializationObject.fragmentOnly = this._fragmentOnly;
-        if (this.texture) {
+        if (this.texture && !this.texture.isRenderTarget) {
             serializationObject.texture = this.texture.serialize();
         }