nineff
diff --git a/‎config/Accessible-full.js
+1-1 b/‎config/Accessible-full.js
+1-1
diff --git a/‎config/Accessible.js
+1-1 b/‎config/Accessible.js
+1-1
diff --git a/‎config/TeX-AMS-MML_HTMLorMML-full.js
+1-1 b/‎config/TeX-AMS-MML_HTMLorMML-full.js
+1-1
diff --git a/‎config/TeX-AMS-MML_HTMLorMML.js
+1-1 b/‎config/TeX-AMS-MML_HTMLorMML.js
+1-1
diff --git a/‎config/TeX-AMS_HTML-full.js
+1-1 b/‎config/TeX-AMS_HTML-full.js
+1-1
diff --git a/‎config/TeX-AMS_HTML.js
+1-1 b/‎config/TeX-AMS_HTML.js
+1-1
diff --git a/‎extensions/TeX/AMSmath.js
+1-1 b/‎extensions/TeX/AMSmath.js
+1-1
diff --git a/‎unpacked/extensions/TeX/AMSmath.js
+1-1 b/‎unpacked/extensions/TeX/AMSmath.js
+1-1
@@ -360,7 +360,7 @@ MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
     GetDelimiterArg: function (name) {
       var c = this.trimSpaces(this.GetArgument(name));
       if (c == "") {return null}
-      if (!TEXDEF.delimiter[c]) {TEX.Error("Missing or unrecognized delimiter for "+name)}
+      if (TEXDEF.delimiter[c] == null) {TEX.Error("Missing or unrecognized delimiter for "+name)}
       return this.convertDelimiter(c);
     },