diff --git a/packages/extension/src/providers/bitcoin/ui/send-transaction/index.vue b/packages/extension/src/providers/bitcoin/ui/send-transaction/index.vue
index 476e459be..0019b36de 100644
--- a/packages/extension/src/providers/bitcoin/ui/send-transaction/index.vue
+++ b/packages/extension/src/providers/bitcoin/ui/send-transaction/index.vue
@@ -305,7 +305,10 @@ const isInputsValid = computed<boolean>(() => {
     isSendToken.value
   )
     return false;
-  if (new BigNumber(sendAmount.value).gt(assetMaxValue.value)) return false;
+
+  const sendAmountBigNumber = new BigNumber(sendAmount.value)
+  if (sendAmountBigNumber.isNaN()) return false
+  if (sendAmountBigNumber.gt(assetMaxValue.value)) return false;
   return true;
 });
 
diff --git a/packages/extension/src/providers/common/ui/send-transaction/send-input-amount.vue b/packages/extension/src/providers/common/ui/send-transaction/send-input-amount.vue
index 206a5fafd..d444b943a 100644
--- a/packages/extension/src/providers/common/ui/send-transaction/send-input-amount.vue
+++ b/packages/extension/src/providers/common/ui/send-transaction/send-input-amount.vue
@@ -73,9 +73,16 @@ const amount = computed({
 
 const onlyNumber = ($event: KeyboardEvent) => {
   const keyCode = $event.keyCode ? $event.keyCode : $event.which;
-  if ((keyCode < 48 || keyCode > 57) && keyCode !== 46) {
-    $event.preventDefault();
+  // Numeric
+  if (keyCode >= /* 0 */ 48 && keyCode <= /* 9 */ 57) {
+    return;
   }
+  // Only allow a single period
+  if (keyCode === /* '.' */ 46 && amount.value.indexOf('.') === -1) {
+    return;
+  }
+  // Alphabetical (/non-numeric) or mulitple periods. Don't propagate change
+  $event.preventDefault();
 };
 const changeFocus = () => {
   isFocus.value = !isFocus.value;
diff --git a/packages/extension/src/providers/ethereum/ui/send-transaction/index.vue b/packages/extension/src/providers/ethereum/ui/send-transaction/index.vue
index d042451b8..74929b82e 100644
--- a/packages/extension/src/providers/ethereum/ui/send-transaction/index.vue
+++ b/packages/extension/src/providers/ethereum/ui/send-transaction/index.vue
@@ -486,7 +486,9 @@ const isInputsValid = computed<boolean>(() => {
   if (!isSendToken.value && !selectedNft.value.id) {
     return false;
   }
-  if (new BigNumber(sendAmount.value).gt(assetMaxValue.value)) return false;
+  const sendAmountBigNumber = new BigNumber(sendAmount.value)
+  if (sendAmountBigNumber.isNaN()) return false
+  if (sendAmountBigNumber.gt(assetMaxValue.value)) return false;
   if (gasCostValues.value.REGULAR.nativeValue === '0') return false;
   return true;
 });
diff --git a/packages/extension/src/providers/solana/ui/send-transaction/index.vue b/packages/extension/src/providers/solana/ui/send-transaction/index.vue
index 12b74be95..55eaedd24 100644
--- a/packages/extension/src/providers/solana/ui/send-transaction/index.vue
+++ b/packages/extension/src/providers/solana/ui/send-transaction/index.vue
@@ -399,7 +399,9 @@ const isInputsValid = computed<boolean>(() => {
   if (!isSendToken.value && !selectedNft.value.id) {
     return false;
   }
-  if (new BigNumber(sendAmount.value).gt(assetMaxValue.value)) return false;
+  const sendAmountBigNumber = new BigNumber(sendAmount.value);
+  if (sendAmountBigNumber.isNaN()) return false;
+  if (sendAmountBigNumber.gt(assetMaxValue.value)) return false;
   return true;
 });