Fix commit bcbade21306f5658be0fdff1c7cc49d35f6d0518

src/renderers/webgl/WebGLState.js

@@ -518,7 +518,7 @@ function WebGLState( gl, extensions, capabilities ) {
 		if ( extension !== null ) {
 
 			equationToGL[ MinEquation ] = extension.MIN_EXT;
-			equationToGL[ MaxEquation ] = extension.MIN_EXT;
+			equationToGL[ MaxEquation ] = extension.MAX_EXT;
 
 		}