diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index 07b0fc6095acdc45860a5bb8534939f539ea1ab0..b1eb2bf88549ee2a83809476976590af2da9492f 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -1089,7 +1089,7 @@ function WebGLRenderer( parameters ) {
 		currentRenderState = renderStates.get( scene, camera );
 		currentRenderState.init();
 
-		scene.onBeforeRender( _this, scene, camera, _currentRenderTarget );
+		scene.onBeforeRender( _this, scene, camera, renderTarget || _currentRenderTarget );
 
 		_projScreenMatrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
 		_frustum.setFromMatrix( _projScreenMatrix );