diff --git a/.github/workflows/build-ci.yml b/.github/workflows/build-ci.yml
index 0c707b9dd..f406209be 100644
--- a/.github/workflows/build-ci.yml
+++ b/.github/workflows/build-ci.yml
@@ -13,9 +13,10 @@ jobs:
       matrix:
         php: [7.1, 7.2, 7.3, 7.4]
         os: ['ubuntu-latest']
+        mongodb: [3.6, 4.0, 4.2]
     services:
       mongo:
-        image: mongo
+        image: mongo:${{ matrix.mongodb }}
         ports:
           - 27017:27017
       mysql:
@@ -26,7 +27,7 @@ jobs:
           MYSQL_ALLOW_EMPTY_PASSWORD: 'yes'
           MYSQL_DATABASE: 'unittest'
           MYSQL_ROOT_PASSWORD:
-    name: PHP ${{ matrix.php }} Test ${{ matrix.env }}
+    name: PHP ${{ matrix.php }} with mongo ${{ matrix.mongodb }}
 
     steps:
     - uses: actions/checkout@v1
@@ -60,3 +61,4 @@ jobs:
       run: vendor/bin/php-coveralls -v
       env:
         COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      continue-on-error: true
diff --git a/.styleci.yml b/.styleci.yml
new file mode 100644
index 000000000..0285f1790
--- /dev/null
+++ b/.styleci.yml
@@ -0,0 +1 @@
+preset: laravel
diff --git a/src/Jenssegers/Mongodb/Eloquent/HybridRelations.php b/src/Jenssegers/Mongodb/Eloquent/HybridRelations.php
index bfe9a2b2c..421a89827 100644
--- a/src/Jenssegers/Mongodb/Eloquent/HybridRelations.php
+++ b/src/Jenssegers/Mongodb/Eloquent/HybridRelations.php
@@ -184,7 +184,7 @@ public function morphTo($name = null, $type = null, $id = null, $ownerKey = null
         // there are multiple types in the morph and we can't use single queries.
         if (($class = $this->$type) === null) {
             return new MorphTo(
-                $this->newQuery(), $this, $id, null, $type, $name
+                $this->newQuery(), $this, $id, $ownerKey, $type, $name
             );
         }
 
@@ -195,8 +195,10 @@ public function morphTo($name = null, $type = null, $id = null, $ownerKey = null
 
         $instance = new $class;
 
+        $ownerKey = $ownerKey ?? $instance->getKeyName();
+
         return new MorphTo(
-            $instance->newQuery(), $this, $id, $instance->getKeyName(), $type, $name
+            $instance->newQuery(), $this, $id, $ownerKey, $type, $name
         );
     }