diff --git a/controls_AutoShuttersControl.txt b/controls_AutoShuttersControl.txt
index 7f23d60..7d98a96 100644
--- a/controls_AutoShuttersControl.txt
+++ b/controls_AutoShuttersControl.txt
@@ -6,7 +6,7 @@ UPD 2020-06-29_09:05:05 30157 lib/FHEM/Automation/ShuttersControl/Shutters.pm
 UPD 2020-06-22_09:41:40 2175 lib/FHEM/Automation/ShuttersControl/Window.pm
 UPD 2020-06-22_09:41:40 11454 lib/FHEM/Automation/ShuttersControl/Dev/Attr.pm
 UPD 2020-06-22_09:41:40 7251 lib/FHEM/Automation/ShuttersControl/Dev/Readings.pm
-UPD 2020-06-29_09:05:05 52344 lib/FHEM/Automation/ShuttersControl/Shutters/Attr.pm
+UPD 2020-06-30_12:34:40 52390 lib/FHEM/Automation/ShuttersControl/Shutters/Attr.pm
 UPD 2020-06-22_09:41:40 2903 lib/FHEM/Automation/ShuttersControl/Shutters/Readings.pm
 UPD 2020-06-22_09:41:40 3972 lib/FHEM/Automation/ShuttersControl/Window/Attr.pm
 UPD 2020-06-22_09:41:40 2288 lib/FHEM/Automation/ShuttersControl/Window/Readings.pm
diff --git a/lib/FHEM/Automation/ShuttersControl/Shutters/Attr.pm b/lib/FHEM/Automation/ShuttersControl/Shutters/Attr.pm
index a58eeb0..cbd95de 100644
--- a/lib/FHEM/Automation/ShuttersControl/Shutters/Attr.pm
+++ b/lib/FHEM/Automation/ShuttersControl/Shutters/Attr.pm
@@ -110,9 +110,10 @@ sub _getPosition {
         );
 
         $posAssignment = (
-              $posAssignment =~ m{\A\d+(\.\d+)?\z}xms
-            ? $posAssignment
-            : 'none'
+                defined($posAssignment)
+            &&  $posAssignment =~ m{\A\d+(\.\d+)?\z}xms
+              ? $posAssignment
+              : 'none'
         );
     }
     else {