diff --git a/c3.js b/c3.js
index a8cae00..edabf35 100644
--- a/c3.js
+++ b/c3.js
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+                    if (hasNegativeValue && ys[baseId]) {
+                        ys[baseId].forEach(function (v, i) {
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+                        ys[baseId].forEach(function (v, i) {
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index 4a08be0..a09d073 100644
--- a/c3.min.js
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