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-rw-r--r--docs/bqn.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/docs/bqn.js b/docs/bqn.js
index 4bc4aead..f0b62638 100644
--- a/docs/bqn.js
+++ b/docs/bqn.js
@@ -50,7 +50,7 @@ let preview = false;
let inpreview = () => preview;
let setc = (d, id, v) => {
- if (preview && !id.e.inpreview)
+ if (preview && id.e != null && !id.e.inpreview)
throw {kind: 'previewError', message: 'side effects are not allowed'};
return set(d, id, v);
}