diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 61e481c907b8..be1435d25e1e 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -72,6 +72,7 @@ The attached binaries can also be downloaded from http://ota.tasmota.com/tasmota
 - Fix ledlink blink when no network connected regression from 8.3.1.4 (#9292)
 - Fix exception 28 due to device group buffer overflow (#9459)
 - Fix shutter timing problem due to buffer overflow in calibration matrix (#9458)
+- Fix light wakeup exception 0 (divide by zero) when ``WakeupDuration`` is not initialised (#9466)
 - Add optional support for Mitsubishi Electric HVAC by David Gwynne (#9237)
 - Add optional support for Orno WE517-Modbus energy meter by Maxime Vincent (#9353)
 - Add SDM630 three phase ImportActive Energy display when ``#define SDM630_IMPORT`` is enabled by Janusz Kostorz (#9124)
diff --git a/tasmota/CHANGELOG.md b/tasmota/CHANGELOG.md
index be54c8e09b0c..8899ce12fc00 100644
--- a/tasmota/CHANGELOG.md
+++ b/tasmota/CHANGELOG.md
@@ -13,6 +13,7 @@
 - Fix ledlink blink when no network connected regression from 8.3.1.4 (#9292)
 - Fix exception 28 due to device group buffer overflow (#9459)
 - Fix shutter timing problem due to buffer overflow in calibration matrix (#9458)
+- Fix light wakeup exception 0 (divide by zero) when ``WakeupDuration`` is not initialised (#9466)
 - Add optional support for Mitsubishi Electric HVAC by David Gwynne (#9237)
 - Add optional support for Orno WE517-Modbus energy meter by Maxime Vincent (#9353)
 - Add SDM630 three phase ImportActive Energy display when ``#define SDM630_IMPORT`` is enabled by Janusz Kostorz (#9124)
diff --git a/tasmota/xdrv_04_light.ino b/tasmota/xdrv_04_light.ino
index e0e3a7e66a7c..ffe346f5d017 100644
--- a/tasmota/xdrv_04_light.ino
+++ b/tasmota/xdrv_04_light.ino
@@ -278,7 +278,7 @@ struct LIGHT {
   uint8_t fixed_color_index = 1;
   uint8_t pwm_offset = 0;                 // Offset in color buffer
   uint8_t max_scheme = LS_MAX -1;
-  
+
   uint32_t wakeup_start_time = 0;
 
   bool update = true;
@@ -1395,6 +1395,9 @@ void LightInit(void)
   Light.power = 0;
   Light.update = true;
   Light.wakeup_active = 0;
+  if (0 == Settings.light_wakeup) {
+    Settings.light_wakeup = 60;         // Fix divide by zero exception 0 in Animate
+  }
   if (Settings.flag4.fade_at_startup) {
     Light.fade_initialized = true;      // consider fade intialized starting from black
   }