diff --git a/CHANGELOG.md b/CHANGELOG.md
index 642b096fa..6d56cc2c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,8 @@
   [#544](https://github.com/nextcloud/cookbook/pull/544/) @seyfeb
 - Refreshing left navigation pane after downloading recipe data, closes #465
   [#547](https://github.com/nextcloud/cookbook/pull/547/) @seyfeb
+- Check for existing `@context` setting in json checker
+  [#554](https://github.com/nextcloud/cookbook/pull/554) @christianlupus
 
 ### Removed
 - Removal of old contoller no longer in use
diff --git a/lib/Service/JsonService.php b/lib/Service/JsonService.php
index e6162f128..fb7db78ff 100644
--- a/lib/Service/JsonService.php
+++ b/lib/Service/JsonService.php
@@ -25,6 +25,11 @@ public function isSchemaObject($obj, string $type = null) : bool {
 			return false;
 		}
 		
+		if (!isset($obj['@context']) || ! preg_match('@^https?://schema\.org/?$@', $obj['@context'])) {
+			// We have no correct context property
+			return false;
+		}
+		
 		if (!isset($obj['@type'])) {
 			// Objects must have a property @type
 			return false;
diff --git a/tests/Unit/Service/JsonServiceTest.php b/tests/Unit/Service/JsonServiceTest.php
index db8d410e8..f6d10c57a 100644
--- a/tests/Unit/Service/JsonServiceTest.php
+++ b/tests/Unit/Service/JsonServiceTest.php
@@ -22,6 +22,31 @@ public function testIsSchemaObject() {
 		$result = $this->service->isSchemaObject($testData);
 		self::assertFalse($result, 'The object must be an array');
 
+		// Objects must have a property @context
+		$testData = [
+			"@type" => "Recipe",
+			"name" => "Schema.org Ontology",
+			"subjectOf" => [
+				"@type" => "Book",
+				"name" => "The Complete History of Schema.org"
+			]
+		];
+		$result = $this->service->isSchemaObject($testData);
+		self::assertFalse($result, 'The object must have a context');
+		
+		// Context must be in schema.org domain
+		$testData = [
+			"@context" => "https://schema.com/",
+			'@type' => 'Recipe',
+			"name" => "Schema.org Ontology",
+			"subjectOf" => [
+				"@type" => "Book",
+				"name" => "The Complete History of Schema.org"
+			]
+		];
+		$result = $this->service->isSchemaObject($testData);
+		self::assertFalse($result, 'The object must be in the correct context');
+		
 		// Objects must have a property @type
 		$testData = [
 			"@context" => "https://schema.org/",
@@ -33,7 +58,7 @@ public function testIsSchemaObject() {
 		];
 		$result = $this->service->isSchemaObject($testData);
 		self::assertFalse($result, 'The object must have the property @type');
-
+		
 		// No typecheck will be requested
 		$testData = [
 			"@context" => "https://schema.org/",