diff --git a/plugin/quickcomment.lua b/plugin/quickcomment.lua
index 36093d4..7d30a57 100644
--- a/plugin/quickcomment.lua
+++ b/plugin/quickcomment.lua
@@ -90,13 +90,13 @@ vim.g.quickcomment_togglecommentlines = function (line_start, line_end)
 
     local escaped_string_prefix = ''
     if vim.b.quickcomment_whitespaceprefix ~= nil then
-        if vim.b.quickcomment_whitespaceprefix ~= 0
-                or vim.b.quickcomment_whitespaceprefix == true then
+        if (type(vim.b.quickcomment_whitespaceprefix) == 'number' and vim.b.quickcomment_whitespaceprefix ~= 0)
+                or (type(vim.b.quickcomment_whitespaceprefix) == 'boolean' and vim.b.quickcomment_whitespaceprefix == true) then
             escaped_string_prefix = '%s*'
         end
     elseif vim.g.quickcomment_whitespaceprefix ~= nil
-            and vim.g.quickcomment_whitespaceprefix ~= 0
-            or vim.g.quickcomment_whitespaceprefix == true then
+            and (type(vim.g.quickcomment_whitespaceprefix) == 'number' and vim.g.quickcomment_whitespaceprefix ~= 0)
+            or (type(vim.g.quickcomment_whitespaceprefix) == 'boolean' and vim.g.quickcomment_whitespaceprefix == true) then
         escaped_string_prefix = '%s*'
     end