diff --git a/src/utils/settings.lua b/src/utils/settings.lua
index 6870b28..df7451d 100644
--- a/src/utils/settings.lua
+++ b/src/utils/settings.lua
@@ -53,7 +53,7 @@ function settings:_parse_settings_str(s)
                     self[k] = v
                 end
             else
-                error(self[k])
+                error(string.format('Unknown settings key "%s"', k))
             end
         end
     end