diff --git a/AAInfographics/AAChartCreator/AAChartView.swift b/AAInfographics/AAChartCreator/AAChartView.swift
index 5f55c1a..0987244 100644
--- a/AAInfographics/AAChartCreator/AAChartView.swift
+++ b/AAInfographics/AAChartCreator/AAChartView.swift
@@ -281,6 +281,7 @@ public class AAChartView: WKWebView {
     }
     
     private func addMouseOverEventMessageHandler() {
+        configuration.userContentController.removeScriptMessageHandler(forName: kUserContentMessageNameMouseOver)
         configuration.userContentController.add(AALeakAvoider.init(delegate: self), name: kUserContentMessageNameMouseOver)
     }