1 files changed, 6 insertions, 4 deletions

diff --git a/imports/codemirror/mode/stex/stex.js b/imports/codemirror/mode/stex/stex.js
index b89e619e..c0739ded 100644
--- a/imports/codemirror/mode/stex/stex.js
+++ b/imports/codemirror/mode/stex/stex.js
@@ -85,10 +85,12 @@ CodeMirror.defineMode("stex", function(cmCfg, modeCfg)
         if (source.match(/^\\[a-zA-Z@]+/)) {
             var cmdName = source.current();
             cmdName = cmdName.substr(1, cmdName.length-1);
-            var plug = plugins[cmdName];
-            if (typeof(plug) == 'undefined') {
-                plug = plugins["DEFAULT"];
-            }
+            var plug;
+            if (plugins.hasOwnProperty(cmdName)) {
+              plug = plugins[cmdName];
+            } else {
+              plug = plugins["DEFAULT"];
+            }
             plug = new plug();
             pushCommand(state, plug);
             setState(state, beginParams);