diff --git a/webbridge.lua b/webbridge.lua
index 50ad2ed..b443408 100644
--- a/webbridge.lua
+++ b/webbridge.lua
@@ -155,7 +155,7 @@ local function drawDashboard()
             
             -- Last seen
             monitor.setTextColor(colors.darkGray)
-            monitor.write(string.format(" %ds", timeSince))
+            monitor.write(string.format(" %ds", timeSince or 0))
             
             y = y + 1
             count = count + 1