diff --git a/src/Utils.php b/src/Utils.php
index 05a2f43..d623b58 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -315,15 +315,31 @@ class Utils
             $json = (array) $json;
             $typeName = [];
 
-            foreach ($json as $key => $param) {
-                if (is_array($param) && $depth > 1) {
-                    foreach ($param as $subKey => $subParam) {
-                        $json[$key][$subKey] = self::jsonToArray($subParam, $depth-1);
+            if ($depth > 1) {
+                foreach ($json as $key => $param) {
+                    if (is_array($param)) {
+                        foreach ($param as $subKey => $subParam) {
+                            $json[$key][$subKey] = self::jsonToArray($subParam, $depth-1);
+                        }
+                    } elseif ($param instanceof stdClass) {
+                        $json[$key] = self::jsonToArray($param, $depth-1);
                     }
                 }
             }
             return $json;
-        } elseif (!is_array($json)) {
+        } elseif (is_array($json)) {
+            if ($depth > 1) {
+                foreach ($json as $key => $param) {
+                    if (is_array($param)) {
+                        foreach ($param as $subKey => $subParam) {
+                            $json[$key][$subKey] = self::jsonToArray($subParam, $depth-1);
+                        }
+                    } elseif ($param instanceof stdClass) {
+                        $json[$key] = self::jsonToArray($param, $depth-1);
+                    }
+                }
+            }
+        } else {
             throw new InvalidArgumentException('jsonToArray json must be array or stdClass.');
         }
         return $json;
diff --git a/test/unit/UtilsTest.php b/test/unit/UtilsTest.php
index 1587cfb..529884d 100644
--- a/test/unit/UtilsTest.php
+++ b/test/unit/UtilsTest.php
@@ -44,7 +44,10 @@ class UtilsTest extends TestCase
       ],
       "payable": false,
       "stateMutability": "nonpayable",
-      "type": "function"
+      "type": "function",
+      "test": {
+        "name": "testObject"
+      }
     }';
 
     /**
@@ -270,13 +273,17 @@ class UtilsTest extends TestCase
     public function testJsonToArray()
     {
         $json = json_decode($this->testJsonMethodString);
-        $jsonArray = Utils::jsonToArray($json);
+        $jsonArrayDepth1 = Utils::jsonToArray($json);
 
-        $this->assertEquals($jsonArray, (array) $json);
+        $this->assertEquals($jsonArrayDepth1, (array) $json);
 
         $jsonAssoc = json_decode($this->testJsonMethodString, true);
-        $jsonArray = Utils::jsonToArray($json, 2);
+        $jsonArrayDepth2 = Utils::jsonToArray($json, 2);
 
-        $this->assertEquals($jsonArray, $jsonAssoc);
+        $this->assertEquals($jsonArrayDepth2, $jsonAssoc);
+
+        $jsonArrayDepth2 = Utils::jsonToArray($jsonArrayDepth1, 2);
+
+        $this->assertEquals($jsonArrayDepth2, $jsonAssoc);
     }
 }
\ No newline at end of file