token existence validation

src/actions/SendFormActions.js

@@ -90,8 +90,20 @@ export const observe = (prevState: ReducersState, action: Action): ThunkAction =
     let shouldUpdate: boolean = false;
     // check if "selectedAccount" reducer changed
     shouldUpdate = reducerUtils.observeChanges(prevState.selectedAccount, currentState.selectedAccount, {
-        account: ['balance', 'nonce'],
+        account: ['balance', 'nonce', 'tokens'],
     });
+    if (shouldUpdate && currentState.sendForm.currency !== currentState.sendForm.networkSymbol) {
+        // make sure that this token is added into account
+        const { account, tokens } = getState().selectedAccount;
+        if (!account) return;
+        const token = findToken(tokens, account.address, currentState.sendForm.currency, account.deviceState);
+        if (!token) {
+            // token not found, re-init form
+            dispatch(init());
+            return;
+        }
+    }
+
 
     // check if "sendForm" reducer changed
     if (!shouldUpdate) {

src/actions/SessionStorageActions.js

@@ -1,5 +1,6 @@
 /* @flow */
 import * as storageUtils from 'utils/storage';
+import { findToken } from 'reducers/TokensReducer';
 
 import type { State as SendFormState } from 'reducers/SendFormReducer';
 import type {
@@ -38,6 +39,16 @@ export const loadDraftTransaction = (): PayloadAction<?SendFormState> => (dispat
         storageUtils.remove(TYPE, key);
         return null;
     }
+    // check if selected currency is token and make sure that this token is added into account
+    if (state.currency !== state.networkSymbol) {
+        const { account, tokens } = getState().selectedAccount;
+        if (!account) return null;
+        const token = findToken(tokens, account.address, state.currency, account.deviceState);
+        if (!token) {
+            storageUtils.remove(TYPE, key);
+            return null;
+        }
+    }
     return state;
 };