Temp fix for https://github.com/firefly-iii/firefly-iii/issues/6753

app/Http/Requests/RuleFormRequest.php

@@ -1,4 +1,5 @@
 <?php
+
 /**
  * RuleFormRequest.php
  * Copyright (c) 2019 james@firefly-iii.org
@@ -66,17 +67,48 @@ class RuleFormRequest extends FormRequest
         if (is_array($triggerData)) {
             foreach ($triggerData as $trigger) {
                 $stopProcessing = $trigger['stop_processing'] ?? '0';
-                $return[]       = [
+                $current        = [
                     'type'            => $trigger['type'] ?? 'invalid',
                     'value'           => $trigger['value'] ?? '',
                     'stop_processing' => 1 === (int)$stopProcessing,
                 ];
+                $current        = self::replaceAmountTrigger($current);
+
+                $return[] = $current;
             }
         }
 
         return $return;
     }
 
+    /**
+     * @param  array  $array
+     * @return array
+     */
+    public static function replaceAmountTrigger(array $array): array
+    {
+        // do some sneaky search and replace.
+        $amountFields = [
+            'amount_is',
+            'amount',
+            'amount_exactly',
+            'amount_less',
+            'amount_max',
+            'amount_more',
+            'amount_min',
+            'foreign_amount_is',
+            'foreign_amount',
+            'foreign_amount_less',
+            'foreign_amount_max',
+            'foreign_amount_more',
+            'foreign_amount_min',
+        ];
+        if (in_array($array['type'], $amountFields, true) && '0' === $array['value']) {
+            $array['value'] = '0.00';
+        }
+        return $array;
+    }
+
     /**
      * @return array
      */

app/Support/Http/Controllers/RequestInformation.php

@@ -27,6 +27,7 @@ use Carbon\Carbon;
 use FireflyIII\Exceptions\FireflyException;
 use FireflyIII\Exceptions\ValidationException;
 use FireflyIII\Helpers\Help\HelpInterface;
+use FireflyIII\Http\Requests\RuleFormRequest;
 use FireflyIII\Http\Requests\TestRuleFormRequest;
 use FireflyIII\Support\Binder\AccountList;
 use FireflyIII\User;
@@ -70,14 +71,15 @@ trait RequestInformation
         $data     = $request->get('triggers');
         if (is_array($data)) {
             foreach ($data as $triggerInfo) {
-                $triggers[] = [
+                $current    = [
                     'type'            => $triggerInfo['type'] ?? '',
                     'value'           => $triggerInfo['value'] ?? '',
                     'stop_processing' => 1 === (int)($triggerInfo['stop_processing'] ?? '0'),
                 ];
+                $current    = RuleFormRequest::replaceAmountTrigger($current);
+                $triggers[] = $current;
             }
         }
-
         return $triggers;
     }