a small fix in case the text is nil

data/core/tokenizer.lua

@@ -225,6 +225,7 @@ function tokenizer.tokenize(incoming_syntax, text, state)
   end
 
   local text_len = text:ulen()
+  if text_len ~= nil then
     while i <= text_len do
       -- continue trying to match the end pattern of a pair if we have a state set
       if current_pattern_idx > 0 then
@@ -315,6 +316,7 @@ function tokenizer.tokenize(incoming_syntax, text, state)
         i = i + 1
       end
     end
+  end
   
   return res, state
 end