Added try-catch to notification close in symbol destructor

stlehmann · Jan 12, 2022 · d5336fb · d5336fb
1 parent fd1c361
commit d5336fb
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/pyads/symbol.py b/pyads/symbol.py
@@ -17,7 +17,7 @@
 
 from . import constants  # To access all constants, use package notation
 from .constants import PLCDataType
-from .pyads_ex import adsGetSymbolInfo
+from .pyads_ex import adsGetSymbolInfo, ADSError
 from .structs import NotificationAttrib
 
 # ads.Connection relies on structs.AdsSymbol (but in type hints only), so use
@@ -229,7 +229,10 @@ def __repr__(self) -> str:
 
     def __del__(self) -> None:
         """Destructor"""
-        self.clear_device_notifications()
+        try:
+            self.clear_device_notifications()
+        except ADSError:
+            pass  # Quietly continue, without a connection no cleanup could be done
 
     def add_device_notification(
             self,