59Inch Collapsible Shower Threshold Water Dam, Silicone Water Barrier Stopper, Self Adhesive Floor Edge Splash Guard Keeps Water Inside for Walk-in Shower, Bathroom, Kitchen Sink 4.9Ft

Use this type of silicone molding for temporary fix. Make sure to caulk both ends. You may remove the shower door and grind the threshold down or carefully remove it and reinstall. Hope it was installed with construction glue. silicone mold