diff --git a/baton.lua b/baton.lua
index 4cc1206..2b4b18d 100644
--- a/baton.lua
+++ b/baton.lua
@@ -66,19 +66,19 @@ local sourceFunction = {keyboardMouse = {}, joystick = {}}
 
 -- checks whether a keyboard key is down or not
 function sourceFunction.keyboardMouse.key(key)
-	return love.keyboard.isDown(key) and 1 or 0
+	return love.keyboard ~= nil and love.keyboard.isDown ~= nil and love.keyboard.isDown(key) and 1 or 0
 end
 
 -- checks whether a keyboard key is down or not,
 -- but it takes a scancode as an input
 function sourceFunction.keyboardMouse.sc(sc)
-	return love.keyboard.isScancodeDown(sc) and 1 or 0
+	return love.keyboard ~= nil and love.keyboard.isScancodeDown ~= nil and  love.keyboard.isScancodeDown(sc) and 1 or 0
 end
 
 -- checks whether a mouse buttons is down or not.
 -- note that baton doesn't detect mouse movement, just the buttons
 function sourceFunction.keyboardMouse.mouse(button)
-	return love.mouse.isDown(tonumber(button)) and 1 or 0
+	return love.mouse ~= nil and love.mouse.isDown ~= nil and love.mouse.isDown(tonumber(button)) and 1 or 0
 end
 
 -- checks the position of a joystick axis