diff --git a/fhem/CHANGED b/fhem/CHANGED
index 0974d44a9..82e34c8f0 100644
--- a/fhem/CHANGED
+++ b/fhem/CHANGED
@@ -1,5 +1,7 @@
 # Add changes at the top of the list. Keep it in ASCII, and 80-char wide.
 # Do not insert empty lines here, update check depends on it
+ - bugfix:  76_SolarForecast: possible Illegal division by zero if Attr
+                              ctrlGenPVdeviation is set to continuously
  - feature: 74_AutomowerConnect.pm: new attribute mowerPanel
  - bugfix:  76_SolarForecast: possible Illegal division by zero if Battery SOC
                               management is activated 
diff --git a/fhem/FHEM/76_SolarForecast.pm b/fhem/FHEM/76_SolarForecast.pm
index 108a1f8bc..587e75f0f 100644
--- a/fhem/FHEM/76_SolarForecast.pm
+++ b/fhem/FHEM/76_SolarForecast.pm
@@ -158,6 +158,7 @@ BEGIN {
 
 # Versions History intern
 my %vNotesIntern = (
+  "1.17.10"=> "19.04.2024  calcTodayPVdeviation: avoid Illegal division by zero, Forum: https://forum.fhem.de/index.php?msg=1311121 ",
   "1.17.9" => "17.04.2024  _batSocTarget: fix Illegal division by zero, Forum: https://forum.fhem.de/index.php?msg=1310930 ",
   "1.17.8" => "16.04.2024  calcTodayPVdeviation: change of calculation ",
   "1.17.7" => "09.04.2024  export pvHistory to CSV, making attr affectMaxDayVariance obsolete ", 
@@ -10215,9 +10216,10 @@ sub calcTodayPVdeviation {
       $dp = sprintf "%.2f", (100 - (100 * $pvfc / $pvre));
   }
   else {
-      my $rodfc = ReadingsNum ($name, 'RestOfDayPVforecast', 0);
-      my $fcun  = $pvfc - $rodfc;                                            # laufende PV Prognose aus Tagesprognose - Prognose Resttag
-      $dp       = sprintf "%.2f", (100 - (100 * $pvre / $fcun));
+      my $rodfc = ReadingsNum ($name, 'RestOfDayPVforecast', 0);             # PV Forecast für den Rest des Tages
+      my $cufc  = $pvfc - $rodfc;                                            # laufende PV Prognose aus Tagesprognose - Prognose Resttag
+      return if(!$cufc);                                                     # Illegal division by zero verhindern Forum:
+      $dp       = sprintf "%.2f", (100 - (100 * $pvre / $cufc));
   }
 
   $data{$type}{$name}{circular}{99}{tdayDvtn} = $dp;
diff --git a/fhem/contrib/DS_Starter/76_SolarForecast.pm b/fhem/contrib/DS_Starter/76_SolarForecast.pm
index 108a1f8bc..587e75f0f 100644
--- a/fhem/contrib/DS_Starter/76_SolarForecast.pm
+++ b/fhem/contrib/DS_Starter/76_SolarForecast.pm
@@ -158,6 +158,7 @@ BEGIN {
 
 # Versions History intern
 my %vNotesIntern = (
+  "1.17.10"=> "19.04.2024  calcTodayPVdeviation: avoid Illegal division by zero, Forum: https://forum.fhem.de/index.php?msg=1311121 ",
   "1.17.9" => "17.04.2024  _batSocTarget: fix Illegal division by zero, Forum: https://forum.fhem.de/index.php?msg=1310930 ",
   "1.17.8" => "16.04.2024  calcTodayPVdeviation: change of calculation ",
   "1.17.7" => "09.04.2024  export pvHistory to CSV, making attr affectMaxDayVariance obsolete ", 
@@ -10215,9 +10216,10 @@ sub calcTodayPVdeviation {
       $dp = sprintf "%.2f", (100 - (100 * $pvfc / $pvre));
   }
   else {
-      my $rodfc = ReadingsNum ($name, 'RestOfDayPVforecast', 0);
-      my $fcun  = $pvfc - $rodfc;                                            # laufende PV Prognose aus Tagesprognose - Prognose Resttag
-      $dp       = sprintf "%.2f", (100 - (100 * $pvre / $fcun));
+      my $rodfc = ReadingsNum ($name, 'RestOfDayPVforecast', 0);             # PV Forecast für den Rest des Tages
+      my $cufc  = $pvfc - $rodfc;                                            # laufende PV Prognose aus Tagesprognose - Prognose Resttag
+      return if(!$cufc);                                                     # Illegal division by zero verhindern Forum:
+      $dp       = sprintf "%.2f", (100 - (100 * $pvre / $cufc));
   }
 
   $data{$type}{$name}{circular}{99}{tdayDvtn} = $dp;