diff --git a/src/GraphQLClientMethods.php b/src/GraphQLClientMethods.php
index 6c46a93..a8f56d4 100644
--- a/src/GraphQLClientMethods.php
+++ b/src/GraphQLClientMethods.php
@@ -161,6 +161,7 @@ private function makeQueryRequest(string $query, bool $withExtensions = false, b
             if ($this->tries < config('shopify-graphql.throttle_max_tries')) {
                 $this->tries++;
 
+                // @phpstan-ignore method.nonObject
                 $this->rateLimitService->waitIfNecessary((float)$this->requestedQueryCost);
 
                 return $this->makeQueryRequest($query, $withExtensions, $detailedCost);
@@ -192,6 +193,7 @@ private function makeMutationRequest(string $query, array $variables, bool $with
             if ($this->tries < config('shopify-graphql.throttle_max_tries')) {
                 $this->tries++;
 
+                // @phpstan-ignore method.nonObject
                 $this->rateLimitService->waitIfNecessary((float)$this->requestedQueryCost);
 
                 return $this->makeMutationRequest($query, $variables, $withExtensions, $detailedCost);
@@ -278,6 +280,8 @@ private function updateRateLimitInfo(array $response): void
             'currentlyAvailable' => $this->currentlyAvailable,
             'restoreRate' => $this->restoreRate,
         ];
+
+        // @phpstan-ignore method.nonObject
         $this->rateLimitService->updateRateLimitInfo($rateLimitData);
     }
 
diff --git a/src/Services/QueryTransformer.php b/src/Services/QueryTransformer.php
index f95a017..5c8ff40 100644
--- a/src/Services/QueryTransformer.php
+++ b/src/Services/QueryTransformer.php
@@ -7,6 +7,7 @@
 use GraphQL\Language\AST\ArgumentNode;
 use GraphQL\Language\AST\FieldNode;
 use GraphQL\Language\AST\NameNode;
+use GraphQL\Language\AST\Node;
 use GraphQL\Language\AST\NodeList;
 use GraphQL\Language\AST\SelectionSetNode;
 use GraphQL\Language\Parser;
@@ -55,10 +56,12 @@ public static function transformQueryWithPagination(string $queryString, array $
 
     private static function applyPaginationArguments(NodeList $arguments, array $paginationArgs): NodeList
     {
+        /** @var Node[] $argsArray */
         $argsArray = iterator_to_array($arguments);
         $argsMap = [];
 
         foreach ($argsArray as $argNode) {
+            // @phpstan-ignore property.notFound
             $argsMap[$argNode->name->value] = $argNode;
         }
 
@@ -86,10 +89,6 @@ private static function phpValueToGraphQLLiteral(mixed $value): string
             return (string)$value;
         }
 
-        if (is_string($value)) {
-            return json_encode($value, JSON_UNESCAPED_UNICODE);
-        }
-
         if (is_array($value)) {
             if (Arr::isAssoc($value)) {
                 $fields = [];
@@ -105,6 +104,6 @@ private static function phpValueToGraphQLLiteral(mixed $value): string
             return '[' . implode(', ', $items) . ']';
         }
 
-        return json_encode((string)$value, JSON_UNESCAPED_UNICODE);
+        return json_encode($value, JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR);
     }
 }