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-rw-r--r--src/parseTools.js1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/parseTools.js b/src/parseTools.js
index 117c4987..f139cc3f 100644
--- a/src/parseTools.js
+++ b/src/parseTools.js
@@ -78,6 +78,7 @@ function toNiceIdent(ident) {
assert(ident);
if (parseFloat(ident) == ident) return ident;
if (ident == 'null') return '0'; // see parseNumerical
+ if (ident == 'undef') return '0';
return ident.replace('%', '$').replace(/["&\\ \.@:<>,\*\[\]\(\)-]/g, '_');
}