diff --git a/ATtiny84_LED_PC.c b/ATtiny84_LED_PC.c
index 94263a8..63aa39d 100644
--- a/ATtiny84_LED_PC.c
+++ b/ATtiny84_LED_PC.c
@@ -444,6 +444,12 @@ void state_switch(uint8_t is_onoff)
 
 	if (is_onoff == 0)
 	{
+		// If we're off don't change anything
+		if (func_idx == sizeof(func_list) / sizeof(func_list[0]) - 1)
+		{
+			return;
+		}
+
 		switch (colour_state)
 		{
 		case STATE_SUN_MOON: