diff --git a/core/src/processing/core/PSurfaceAWT.java b/core/src/processing/core/PSurfaceAWT.java
index b5594d450..d40e2bda3 100644
--- a/core/src/processing/core/PSurfaceAWT.java
+++ b/core/src/processing/core/PSurfaceAWT.java
@@ -831,9 +831,13 @@ public class PSurfaceAWT implements PSurface {
 
 //    canvas.setSize(wide, high);
 //    frame.setSize(wide, high);
-    setFrameSize(); //wide, high);
+    if (frame != null) {  // canvas only
+      setFrameSize(); //wide, high);
+    }
     setCanvasSize();
-    frame.setLocationRelativeTo(null);
+    if (frame != null) {
+      frame.setLocationRelativeTo(null);
+    }
 
     GraphicsConfiguration gc = canvas.getGraphicsConfiguration();
     // If not realized (off-screen, i.e the Color Selector Tool), gc will be null.