diff --git a/B12NumbersV3/guiButton.pde b/B12NumbersV3/guiButton.pde
index 7927543..587c16f 100644
--- a/B12NumbersV3/guiButton.pde
+++ b/B12NumbersV3/guiButton.pde
@@ -20,7 +20,7 @@ class Button{
     highlight = color(100);
     mouseOver = false;
     ch.addl(new LiveMethodRelay(this, "clicked", float.class, float.class));
-    data = new Object[0];
+    data = null;
   }
   Button(ClickHandler _ch, PVector _pos, PVector _dim){
     this(_ch, _pos, _dim, 0);
diff --git a/B12NumbersV3/guiMathPad.pde b/B12NumbersV3/guiMathPad.pde
index 5238137..1e0b80c 100644
--- a/B12NumbersV3/guiMathPad.pde
+++ b/B12NumbersV3/guiMathPad.pde
@@ -47,7 +47,7 @@ class B12Button extends Button{
   
   B12Button(ClickHandler _ch, PVector _pos, PVector _dim, float _radius, B12Digit _digit){
     super(_ch,_pos,_dim,_radius);
-    data = (Object[])append(data, _digit);
+    data = new Object[]{_digit}; //(Object[])append(data, _digit); commented version deprecated. required initializing array in Button
     digit = _digit;
   }
   B12Button(ClickHandler _ch, PVector _pos, PVector _dim, B12Digit _digit){