diff --git a/src/GenericResource.php b/src/GenericResource.php
index 9252105..49f3e9c 100755
--- a/src/GenericResource.php
+++ b/src/GenericResource.php
@@ -50,13 +50,13 @@ public function toArray($request)
 
                     foreach ($value as $key2 => $value2) {
                         try {
-                            if ($this->{$key2} instanceof Collection) {
-                                $data[$key2] = new GenericResourceCollection($this->{$key2}, $value2);
-                            } else if (\gettype($this->{$key2}) === 'object') {
-                                $data[$key2] = new GenericResource($this->{$key2}, $value2);
+                            if ($this->$key2 instanceof Collection) {
+                                $data[$key2] = new GenericResourceCollection($this->$key2, $value2);
+                            } else if (\gettype($this->$key2) === 'object') {
+                                $data[$key2] = new GenericResource($this->$key2, $value2);
                             }
                             //Property name change
-                            else if(\gettype($this->{$value2}) === 'string' && ($this->$value2 || method_exists($this->resource, $value2) || property_exists($this->resource, $value2)))
+                            else if((\gettype($value2) === 'string' && \gettype($this->$value2) === 'string') && ($this->$value2 || method_exists($this->resource, $value2) || property_exists($this->resource, $value2)))
                                 $data[$key2] = $this->$value2;
                             else if (method_exists($this->resource, $key2) || property_exists($this->resource, $key2)) {
                                 $data[$key2] = $this->$key2;
@@ -72,12 +72,12 @@ public function toArray($request)
 
                         $newKey = !\is_numeric($key) ? $key : $value;
 
-                        if ($this->{$value} instanceof Collection) {
-                            $data[$newKey] = new GenericResourceCollection($this->{$value});
-                        } else if (\gettype($this->{$value}) === 'object') {
-                            $data[$newKey] = new GenericResource($this->{$value});
-                        } else if ($this->{$value} || method_exists($this->resource, $value) || property_exists($this->resource, $value)) {
-                            $data[$newKey] = $this->{$value};
+                        if ($this->$value instanceof Collection) {
+                            $data[$newKey] = new GenericResourceCollection($this->$value);
+                        } else if (\gettype($this->$value) === 'object') {
+                            $data[$newKey] = new GenericResource($this->$value);
+                        } else if ($this->$value || method_exists($this->resource, $value) || property_exists($this->resource, $value)) {
+                            $data[$newKey] = $this->$value;
                         }
 
                     } catch (\Throwable $th) {