diff --git a/apps/files_sharing/lib/Controller/ShareAPIController.php b/apps/files_sharing/lib/Controller/ShareAPIController.php
index bd57d80dab0..15be82e9572 100644
--- a/apps/files_sharing/lib/Controller/ShareAPIController.php
+++ b/apps/files_sharing/lib/Controller/ShareAPIController.php
@@ -450,7 +450,7 @@ class ShareAPIController extends OCSController {
 			}
 			$share->setSharedWith($shareWith);
 		} else if ($shareType === \OCP\Share::SHARE_TYPE_CIRCLE) {
-			if (!\OCP\App::isEnabled('circles')) {
+			if (!\OC::$server->getAppManager()->isEnabledForUser('circles') || !class_exists('\OCA\Circles\ShareByCircleProvider')) {
 				throw new OCSNotFoundException($this->l->t('You cannot share to a Circle if the app is not enabled'));
 			}
 
diff --git a/apps/files_sharing/lib/Controller/ShareesAPIController.php b/apps/files_sharing/lib/Controller/ShareesAPIController.php
index 57d51ebac6a..3e0c01b342e 100644
--- a/apps/files_sharing/lib/Controller/ShareesAPIController.php
+++ b/apps/files_sharing/lib/Controller/ShareesAPIController.php
@@ -472,7 +472,7 @@ class ShareesAPIController extends OCSController {
 			$shareTypes[] = Share::SHARE_TYPE_EMAIL;
 		}
 
-		if (\OCP\App::isEnabled('circles')) {
+		if (\OC::$server->getAppManager()->isEnabledForUser('circles') && class_exists('\OCA\Circles\ShareByCircleProvider')) {
 			$shareTypes[] = Share::SHARE_TYPE_CIRCLE;
 		}
 
diff --git a/lib/private/Share20/ProviderFactory.php b/lib/private/Share20/ProviderFactory.php
index ddd8177250b..aedad6a32a7 100644
--- a/lib/private/Share20/ProviderFactory.php
+++ b/lib/private/Share20/ProviderFactory.php
@@ -51,9 +51,10 @@ class ProviderFactory implements IProviderFactory {
 	private $federatedProvider = null;
 	/** @var  ShareByMailProvider */
 	private $shareByMailProvider;
-	/** @var  \OCA\Circles\ShareByCircleProvider;
-	 * ShareByCircleProvider */
-	private $shareByCircleProvider;
+	/** @var  \OCA\Circles\ShareByCircleProvider */
+	private $shareByCircleProvider = null;
+	/** @var bool */
+	private $circlesAreNotAvailable = false;
 
 	/**
 	 * IProviderFactory constructor.
@@ -179,11 +180,16 @@ class ProviderFactory implements IProviderFactory {
 	 */
 	protected function getShareByCircleProvider() {
 
-		$appManager = $this->serverContainer->getAppManager();
-		if (!$appManager->isEnabledForUser('circles')) {
+		if ($this->circlesAreNotAvailable) {
 			return null;
 		}
 
+		if (!$this->serverContainer->getAppManager()->isEnabledForUser('circles') ||
+			!class_exists('\OCA\Circles\ShareByCircleProvider')
+		) {
+			$this->circlesAreNotAvailable = true;
+			return null;
+		}
 
 		if ($this->shareByCircleProvider === null) {