Fix for #1784

app/Rules/ZeroOrMore.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace FireflyIII\Rules;
+
+use Illuminate\Contracts\Validation\Rule;
+
+/**
+ *
+ * Class ZeroOrMore
+ */
+class ZeroOrMore implements Rule
+{
+
+    /**
+     * Get the validation error message.
+     *
+     * @return string
+     */
+    public function message(): string
+    {
+        return trans('validation.zero_or_more');
+    }
+
+    /**
+     * Determine if the validation rule passes.
+     *
+     * @param  string $attribute
+     * @param  mixed  $value
+     *
+     * @return bool
+     */
+    public function passes($attribute, $value): bool
+    {
+        $value = (string)$value;
+        if ('' === $value) {
+            return true;
+        }
+        $res = bccomp('0', $value);
+        if ($res > 0) {
+            return false;
+        }
+
+        return true;
+    }
+}