diff --git a/app/Http/ValidationRules/Credit/ValidCreditsRules.php b/app/Http/ValidationRules/Credit/ValidCreditsRules.php
index f745092fe967..b8d6d2624ed8 100644
--- a/app/Http/ValidationRules/Credit/ValidCreditsRules.php
+++ b/app/Http/ValidationRules/Credit/ValidCreditsRules.php
@@ -51,6 +51,15 @@ class ValidCreditsRules implements Rule
 
         $unique_array = [];
         
+        $total_credit_amount = array_sum(array_column($this->input['credits'], 'amount'));
+
+        if($total_credit_amount <= 0){
+
+            $this->error_msg = "Total of credits must be more than zero.";
+
+            return false;
+        }
+
         $cred_collection = Credit::withTrashed()->whereIn('id', array_column($this->input['credits'], 'credit_id'))->get();
 
         foreach ($this->input['credits'] as $credit) {
diff --git a/app/Services/ClientPortal/InstantPayment.php b/app/Services/ClientPortal/InstantPayment.php
index 9ab3dc581e1e..9d03393b2e59 100644
--- a/app/Services/ClientPortal/InstantPayment.php
+++ b/app/Services/ClientPortal/InstantPayment.php
@@ -48,6 +48,7 @@ class InstantPayment
 
     public function run()
     {
+
         $is_credit_payment = false;
 
         $tokens = [];
@@ -107,6 +108,7 @@ class InstantPayment
             $payable_amount = Number::roundValue(Number::parseFloat($payable_invoice['amount'], $client->currency()->precision));
             $invoice_balance = Number::roundValue(($invoice->partial > 0 ? $invoice->partial : $invoice->balance), $client->currency()->precision);
 
+
             /*If we don't allow under/over payments force the payable amount - prevents inspect element adjustments in JS*/
 
             if ($settings->client_portal_allow_under_payment == false && $settings->client_portal_allow_over_payment == false) {