fix: add guard for draft tx in send validation

ui/ducks/send/send.js

@@ -989,6 +989,10 @@ const slice = createSlice({
       const draftTransaction =
         state.draftTransactions[state.currentTransactionUUID];
 
+      if (!draftTransaction) {
+        return;
+      }
+
       // use maxFeePerGas as the multiplier if working with a FEE_MARKET transaction
       // otherwise use gasPrice
       if (
@@ -1080,7 +1084,7 @@ const slice = createSlice({
       const draftTransaction =
         state.draftTransactions[state.currentTransactionUUID];
       let amount = '0x0';
-      if (draftTransaction.sendAsset.type === AssetType.token) {
+      if (draftTransaction?.sendAsset.type === AssetType.token) {
         const decimals = draftTransaction.sendAsset.details?.decimals ?? 0;
 
         const multiplier = Math.pow(10, Number(decimals));
@@ -1292,7 +1296,7 @@ const slice = createSlice({
       state.gasTotalForLayer1 = action.payload;
       if (
         state.amountMode === AMOUNT_MODES.MAX &&
-        draftTransaction.sendAsset.type === AssetType.native
+        draftTransaction?.sendAsset.type === AssetType.native
       ) {
         slice.caseReducers.updateAmountToMax(state);
       }
@@ -1456,6 +1460,10 @@ const slice = createSlice({
       const draftTransaction =
         state.draftTransactions[state.currentTransactionUUID];
 
+      if (!draftTransaction) {
+        return;
+      }
+
       const amountValue = new Numeric(draftTransaction.amount.value, 16);
 
       switch (true) {
@@ -1557,6 +1565,11 @@ const slice = createSlice({
     validateGasField: (state) => {
       const draftTransaction =
         state.draftTransactions[state.currentTransactionUUID];
+
+      if (!draftTransaction) {
+        return;
+      }
+
       const insufficientFunds = !isBalanceSufficient({
         amount:
           draftTransaction.sendAsset.type === AssetType.native

ui/ducks/send/send.test.js

@@ -283,7 +283,28 @@ describe('Send Slice', () => {
         expect(draft.amount.value).toStrictEqual('0xadf7');
         expect(draft.status).toStrictEqual(SEND_STATUSES.VALID);
       });
+
+      it('should not error when draft transaction is not defined', () => {
+        const state = getInitialSendStateWithExistingTxState({
+          gas: {
+            gasPrice: '0x1',
+            maxFeePerGas: '0x2',
+            gasLimit: GAS_LIMITS.SIMPLE,
+          },
+        });
+
+        delete state.draftTransactions['test-uuid'];
+
+        const action = {
+          type: 'send/calculateGasTotal',
+        };
+
+        const runAction = () => sendReducer(state, action);
+
+        expect(runAction).not.toThrow();
+      });
     });
+
     describe('resetSendState', () => {
       it('should set the state back to a blank slate matching the initialState object', () => {
         const action = {
@@ -1076,6 +1097,29 @@ describe('Send Slice', () => {
         );
         expect(draftTransaction.status).toBe(SEND_STATUSES.INVALID);
       });
+
+      it('should not throw error when draft transaction does not exist', () => {
+        const tokenAssetState = getInitialSendStateWithExistingTxState({
+          amount: {
+            value: '0x77359400', // 2000000000
+          },
+          sendAsset: {
+            type: AssetType.token,
+            balance: '0x6fc23ac0', // 1875000000
+            details: {
+              decimals: 0,
+            },
+          },
+        });
+
+        const action = {
+          type: 'send/validateAmountField',
+        };
+
+        delete tokenAssetState.draftTransactions['test-uuid'];
+
+        expect(() => sendReducer(tokenAssetState, action)).not.toThrow();
+      });
     });
 
     describe('validateGasField', () => {
@@ -1101,6 +1145,24 @@ describe('Send Slice', () => {
           INSUFFICIENT_FUNDS_ERROR,
         );
       });
+      it('should not throw error when draft transaction does not exist', () => {
+        const gasFieldState = getInitialSendStateWithExistingTxState({
+          account: {
+            balance: '0x0',
+          },
+          gas: {
+            gasTotal: '0x1319718a5000', // 21000000000000
+          },
+        });
+
+        delete gasFieldState.draftTransactions['test-uuid'];
+
+        const action = {
+          type: 'send/validateGasField',
+        };
+
+        expect(() => sendReducer(gasFieldState, action)).not.toThrow();
+      });
     });
 
     // TODO: update this