Index: lib/filterClasses.js
===================================================================
--- a/lib/filterClasses.js
+++ b/lib/filterClasses.js
@@ -753,18 +753,16 @@
       if (separatorIndex >= 0)
       {
         value = option.substr(separatorIndex + 1);
         option = option.substr(0, separatorIndex);
       }
       option = option.replace(/-/, "_").toUpperCase();
       if (option in RegExpFilter.typeMap)
       {
-        if (contentType == null)
-          contentType = 0;
         contentType |= RegExpFilter.typeMap[option];
 
         if (option == "CSP" && value)
           csp = value;
       }
       else if (option[0] == "~" && option.substr(1) in RegExpFilter.typeMap)
       {
         if (contentType == null)