diff --git a/imports/helpers.js b/imports/helpers.js
index c38a010..9f0c0f5 100644
--- a/imports/helpers.js
+++ b/imports/helpers.js
@@ -80,11 +80,12 @@ export function validatePassword(password = '', showMessage, clearMessage){
   }
 };
 
-export function validateUsername(username, showMessage, clearMessage) {
+export function validateUsername(username, showMessage, clearMessage, formState) {
   if ( username ) {
     return true;
   } else {
-    showMessage(T9n.get("error.usernameRequired"), 'warning', false, 'username');
+    const fieldName = (passwordSignupFields() === 'USERNAME_ONLY' || formState === STATES.SIGN_UP) ? 'username' : 'usernameOrEmail';
+    showMessage(T9n.get("error.usernameRequired"), 'warning', false, fieldName);
     return false;
   }
 }
diff --git a/imports/ui/components/Field.jsx b/imports/ui/components/Field.jsx
index 5741dd1..79e0076 100644
--- a/imports/ui/components/Field.jsx
+++ b/imports/ui/components/Field.jsx
@@ -12,7 +12,7 @@ export class Field extends React.Component {
   triggerUpdate() {
     // Trigger an onChange on inital load, to support browser prefilled values.
     const { onChange } = this.props;
-    if (this.input && this.input.value) {
+    if (this.input && onChange) {
       onChange({ target: { value: this.input.value } });
     }
   }
diff --git a/imports/ui/components/Form.jsx b/imports/ui/components/Form.jsx
index f43578f..a4301c0 100644
--- a/imports/ui/components/Form.jsx
+++ b/imports/ui/components/Form.jsx
@@ -34,7 +34,7 @@ export class Form extends React.Component {
         ref={(ref) => this.form = ref}
         className={[className, ready ? "ready" : null].join(' ')}
         className="accounts-ui"
-        novalidate
+        noValidate
       >
         <Accounts.ui.Fields fields={ fields } />
         <Accounts.ui.Buttons buttons={ buttons } />
diff --git a/imports/ui/components/LoginForm.jsx b/imports/ui/components/LoginForm.jsx
index a8e05cb..d0d1b9e 100644
--- a/imports/ui/components/LoginForm.jsx
+++ b/imports/ui/components/LoginForm.jsx
@@ -92,6 +92,7 @@ export class LoginForm extends Tracker.Component {
   }
 
   validateField(field, value) {
+    const { formState } = this.state;
     switch(field) {
       case 'email':
         return validateEmail(value,
@@ -107,6 +108,7 @@ export class LoginForm extends Tracker.Component {
         return validateUsername(value,
           this.showMessage.bind(this),
           this.clearMessage.bind(this),
+          formState,
         );
     }
   }
@@ -425,7 +427,7 @@ export class LoginForm extends Tracker.Component {
   setDefaultFieldValues(defaults) {
     if (typeof defaults !== 'object') {
       throw new Error('Argument to setDefaultFieldValues is not of type object');
-    } else if (localStorage) {
+    } else if (typeof localStorage !== 'undefined' && localStorage) {
       localStorage.setItem('accounts_ui', JSON.stringify({
         passwordSignupFields: passwordSignupFields(),
         ...this.getDefaultFieldValues(),
@@ -438,7 +440,7 @@ export class LoginForm extends Tracker.Component {
    * Helper to get field values when switching states in the form.
    */
   getDefaultFieldValues() {
-    if (localStorage) {
+    if (typeof localStorage !== 'undefined' && localStorage) {
       const defaultFieldValues = JSON.parse(localStorage.getItem('accounts_ui') || null);
       if (defaultFieldValues
         && defaultFieldValues.passwordSignupFields === passwordSignupFields()) {
@@ -451,7 +453,7 @@ export class LoginForm extends Tracker.Component {
    * Helper to clear field values when signing in, up or out.
    */
   clearDefaultFieldValues() {
-    if (localStorage) {
+    if (typeof localStorage !== 'undefined' && localStorage) {
       localStorage.removeItem('accounts_ui');
     }
   }
@@ -906,12 +908,14 @@ export class LoginForm extends Tracker.Component {
 
   componentWillMount() {
     // XXX Check for backwards compatibility.
-    const container = document.createElement('div');
-    ReactDOM.render(<Accounts.ui.Field message="test" />, container);
-    if (container.getElementsByClassName('message').length == 0) {
-      // Found backwards compatibility issue with 1.3.x
-      console.warn(`Implementations of Accounts.ui.Field must render message in v1.2.11.
-        https://github.com/studiointeract/accounts-ui/#deprecations`);
+    if (Meteor.isClient) {
+      const container = document.createElement('div');
+      ReactDOM.render(<Accounts.ui.Field message="test" />, container);
+      if (container.getElementsByClassName('message').length == 0) {
+        // Found backwards compatibility issue with 1.3.x
+        console.warn(`Implementations of Accounts.ui.Field must render message in v1.2.11.
+          https://github.com/studiointeract/accounts-ui/#deprecations`);
+      }
     }
   }