diff --git a/src/webgl/p5.RendererGL.Immediate.js b/src/webgl/p5.RendererGL.Immediate.js
index 5a2beaf990..2409dae3d6 100644
--- a/src/webgl/p5.RendererGL.Immediate.js
+++ b/src/webgl/p5.RendererGL.Immediate.js
@@ -134,6 +134,12 @@ p5.RendererGL.prototype.vertex = function(x, y) {
         u /= this._tex.width;
         v /= this._tex.height;
       }
+    } else if (
+      this.userFillShader !== undefined ||
+      this.userStrokeShader !== undefined ||
+      this.userPointShader !== undefined
+    ) {
+    // Do nothing if user-defined shaders are present
     } else if (
       this._tex === null &&
       arguments.length >= 4