diff --git a/system/src/Grav/Common/GPM/GPM.php b/system/src/Grav/Common/GPM/GPM.php
index 2da8a2864..d689acfda 100644
--- a/system/src/Grav/Common/GPM/GPM.php
+++ b/system/src/Grav/Common/GPM/GPM.php
@@ -251,7 +251,7 @@ class GPM extends Iterator
                 $repository[$slug]->version = $local_version;
                 $repository[$slug]->name = $repository[$slug]->name;
                 $repository[$slug]->type = $repository[$slug]->release_type;
-                $items[$slug] = $repository[$slug];
+                $items[$slug] = $repository[$slug]->toArray();
             }
         }
 
@@ -330,7 +330,7 @@ class GPM extends Iterator
                 $repository[$slug]->available = $remote_version;
                 $repository[$slug]->version = $local_version;
                 $repository[$slug]->type = $repository[$slug]->release_type;
-                $items[$slug] = $repository[$slug];
+                $items[$slug] = $repository[$slug]->toArray();
             }
         }