diff --git a/adjuster.py b/adjuster.py
index fc717104ce81566b0d60c1eb84563edd9b9cf54d..420870fc8b60b1964ab22081d4be482499e86145 100755
--- a/adjuster.py
+++ b/adjuster.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-program_name = "Web Adjuster v0.203 (c) 2012-16 Silas S. Brown"
+program_name = "Web Adjuster v0.204 (c) 2012-16 Silas S. Brown"
 
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -1480,7 +1480,7 @@ document.forms[0].i.focus()
     def serve_err(self,err):
         self.set_status(500)
         self.add_header("Content-Type","text/plain")
-        # logging.error(err+' '+repr(self.request.body))
+        logging.error("Bookmarklet error: "+err) # +' '+repr(self.request.body)
         self.write(err) ; self.myfinish()
     def serve_bookmarklet_json(self,filterNo):
         self.add_header("Access-Control-Allow-Origin","*")
@@ -1491,6 +1491,8 @@ document.forms[0].i.focus()
             self.write("OK") ; return self.myfinish()
         try: l = json.loads(self.request.body)
         except: return self.serve_err("Bad JSON")
+        for i in xrange(len(l)):
+            if l[i]=='': l[i] = u'' # shouldn't get this (TODO: fix in bookmarkletMainScript? e.g. if submitBookmarkletFilterJS can match empty strings, or conversion to 'cnv' makes it empty, anything else?), but if we do, don't let it trip up the 'wrong data structue' below
         if not (type(l)==list and all((type(i)==type(u"") and not chr(0) in i) for i in l)): return self.serve_err("Wrong data structure")
         codeTextList = []
         for i in l: