do not push null geometries

1 files changed, 3 insertions, 1 deletions

diff --git a/lsys.js b/lsys.js
index 9a027e7..f492f84 100644
--- a/lsys.js
+++ b/lsys.js
@@ -75,7 +75,9 @@ function LSystem(axiom, rules, draw_constants) {
           geometry = [[x,y,z]];
           break;
         case ']':
-          coords.push(geometry);
+          if (geometry.length > 1) {
+            coords.push(geometry);
+          }
           geometry = stack.pop();
           U = stack.pop();
           L = stack.pop();