diff --git a/scripts/lua/modules/alert.lua b/scripts/lua/modules/alert.lua
index 42f0371346..4ae9b10746 100644
--- a/scripts/lua/modules/alert.lua
+++ b/scripts/lua/modules/alert.lua
@@ -133,7 +133,8 @@ function Alert:set_granularity(granularity)
 
    self.granularity = alert_consts.alerts_granularities[granularity]
    if(self.granularity == nil) then
-      print("[ERROR] Unknown granularity "..(granularity or '').."\n")
+      print("[ERROR] Unknown granularity\n")
+      tprint(granularity)
       print(debug.traceback())
    end
 end