diff --git a/mathjax/jax/output/HTML-CSS/jax.js b/mathjax/jax/output/HTML-CSS/jax.js
index b7fd89da7..504a7f427 100644
--- a/mathjax/jax/output/HTML-CSS/jax.js
+++ b/mathjax/jax/output/HTML-CSS/jax.js
@@ -13,7 +13,7 @@
*/
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diff --git a/mathjax/unpacked/jax/output/HTML-CSS/jax.js b/mathjax/unpacked/jax/output/HTML-CSS/jax.js
index 9b160527e..2688312bf 100644
--- a/mathjax/unpacked/jax/output/HTML-CSS/jax.js
+++ b/mathjax/unpacked/jax/output/HTML-CSS/jax.js
@@ -2130,7 +2130,8 @@
// Force image mode for iPhone and Droid
// FIXME: need to work more on this
var config = MathJax.Hub.config["HTML-CSS"];
- config.availableFonts = []; config.preferredFont = null;
+ if (config) {config.availableFonts = []; config.preferredFont = null}
+ else {MathJax.Hub.config["HTML-CSS"] = {availableFonts: [], preferredFont: null}}
}
},