diff --git a/lib/main.js b/lib/main.js
index 41b19c6c..7f9f9a10 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -195,6 +195,10 @@ function ConfigureMathJax() {
         AddError("SVG - Unknown character: U+"+message[1].toString(16).toUpperCase()+
                     " in "+(message[2].fonts||["unknown"]).join(","),!undefinedChar);
       });
+      MathJax.Hub.Register.MessageHook("CommonHTML Jax - unknown char",function (message) {
+        AddError("CHTML - Unknown character: U+"+message[1].toString(16).toUpperCase()+
+                    " in "+(message[2].fonts||["unknown"]).join(","),!undefinedChar);
+      });
       MathJax.Hub.Register.MessageHook("MathML Jax - unknown node type",function (message) {
         AddError("MathML - Unknown node type: "+message[1]);
       });
diff --git a/test/base-warnings.js b/test/base-warnings.js
new file mode 100644
index 00000000..cd61cd73
--- /dev/null
+++ b/test/base-warnings.js
@@ -0,0 +1,11 @@
+var tape = require('tape');
+var mjAPI = require("../lib/main.js");
+mjAPI.config({undefinedCharError: true});
+
+tape('basic test: check warnings', function (t) {
+    t.plan(2);
+    mjAPI.typeset({math:'呵', html:true})
+        .catch(errors => t.ok(errors, 'CommonHTML output reports error'));
+    mjAPI.typeset({math:'呵', svg:true})
+        .catch(errors => t.ok(errors, 'SVG output reports error'));
+});