diff --git a/ios/Classes/SwiftFlutterHtmlToPdfPlugin.swift b/ios/Classes/SwiftFlutterHtmlToPdfPlugin.swift
index 299e255..b9d51d2 100644
--- a/ios/Classes/SwiftFlutterHtmlToPdfPlugin.swift
+++ b/ios/Classes/SwiftFlutterHtmlToPdfPlugin.swift
@@ -47,6 +47,7 @@ public class SwiftFlutterHtmlToPdfPlugin: NSObject, FlutterPlugin{
                 }
                 
                 // dispose WKWebView
+                self.urlObservation = nil
                 self.wkWebView = nil
                 result(convertedFilePath)
             }