--- a/javascript.editing/src/org/netbeans/modules/javascript/editing/lexer/JsLexer.java	Thu Mar 17 08:04:44 2011 +0100
+++ a/javascript.editing/src/org/netbeans/modules/javascript/editing/lexer/JsLexer.java	Tue Mar 22 16:04:35 2011 +0100
@@ -206,7 +206,11 @@ 
         int token;
 
         try {
-            token = tokenStream.getToken() & Parser.CLEAR_TI_MASK;
+            token = tokenStream.getToken();
+            //ERROR is -1 (the only negative token), with all bits on 1 and I don't want to AND that.
+            if (token != org.mozilla.nb.javascript.Token.ERROR) {
+                token = token & Parser.CLEAR_TI_MASK;
+            }
         } catch (IOException ex) {
             ErrorManager.getDefault().notify(ex);
             token = org.mozilla.nb.javascript.Token.ERROR;
@@ -236,7 +240,6 @@ 
     private JsTokenId getTokenId(int token) {
         // If you add any new token types here, remember to update #getRelevantTokenTypes below
         switch (token) {
-        case 65535: // SIGN ERRORS! Why does this happen?
         case Token.ERROR://          = -1, // well-known as the only code < EOF
             return JsTokenId.ERROR;
         case Token.LINE_COMMENT: