diff --git a/web/src/ProviderEditPage.js b/web/src/ProviderEditPage.js
index ca7fd78b..0a7e6c51 100644
--- a/web/src/ProviderEditPage.js
+++ b/web/src/ProviderEditPage.js
@@ -174,7 +174,11 @@ class ProviderEditPage extends React.Component {
       }
     }
 
-    provider.userMapping[key] = value;
+    if (value === "") {
+      delete provider.userMapping[key];
+    } else {
+      provider.userMapping[key] = value;
+    }
 
     this.setState({
       provider: provider,