diff --git a/src/webapp.jsx b/src/webapp.jsx
index 6457326f..79ccc945 100644
--- a/src/webapp.jsx
+++ b/src/webapp.jsx
@@ -2717,7 +2717,7 @@ class ValidationView extends React.PureComponent {
     super(props);
 
     this.state = {
-      code: props.credCode
+      code: props.credCode || ''
     };
 
     this.handleChange = this.handleChange.bind(this);
@@ -2725,10 +2725,6 @@ class ValidationView extends React.PureComponent {
     this.handleSubmit = this.handleSubmit.bind(this);
   }
 
-  static getDerivedStateFromProps(nextProps, prevState) {
-    return {code: nextProps.credCode};
-  }
-
   handleChange(e) {
     this.setState({code: e.target.value});
   }