Actually working dirty fix for division by 0

inventory.py

@@ -219,7 +219,9 @@ def progress(self) -> float:
         if self.required_minutes:   # Quick fix to prevent division by zero crash
             return self.current_minutes / self.required_minutes
         else:
-            return "!!!required_minutes = 0 This could be due to a subscription requirement, tracked in Issue #101!!!"
+            self._manager.print(f'!!!required_minutes for "{self.name}" is 0 This could be due to a subscription requirement, tracked in Issue #101!!!')
+            self.preconditions_met = False
+            return 0
 
     def _on_claim(self) -> None:
         result = super()._on_claim()