diff --git a/api/src/Categories.php b/api/src/Categories.php
index da6c22fb99..ab9b962dd8 100644
--- a/api/src/Categories.php
+++ b/api/src/Categories.php
@@ -557,7 +557,7 @@ class Categories
 		$owner_grant = false;
 		foreach(explode(',',$category['owner']) as $owner)
 		{
-			$owner_grant = $owner_grant || (($this->grants[$owner] & $needed) &&
+			$owner_grant = $owner_grant || (is_array($this->grants) && ($this->grants[$owner] & $needed) &&
 				($category['access'] == 'public' ||  ($this->grants[$owner] & Acl::PRIVAT)));
 		}
 		return $acl_grant && $owner_grant;
diff --git a/api/src/Contacts.php b/api/src/Contacts.php
index c568916d9a..581dccd2f5 100755
--- a/api/src/Contacts.php
+++ b/api/src/Contacts.php
@@ -1271,7 +1271,7 @@ class Contacts extends Contacts\Storage
 					$shared['shared_writable'] && $this->check_perms($needed, $contact, $deny_account_delete, $shared['shared_by'], $check_shared-1)))
 				{
 					$access = "shared";
-					error_log(__METHOD__."($needed,$contact[id],$deny_account_delete,$user,$check_shared) shared=".json_encode($shared)." returning ".array2string($access));
+					//error_log(__METHOD__."($needed,$contact[id],$deny_account_delete,$user,$check_shared) shared=".json_encode($shared)." returning ".array2string($access));
 					break;
 				}
 			}
diff --git a/api/src/Storage/Merge.php b/api/src/Storage/Merge.php
index 650b45a779..db00079faf 100644
--- a/api/src/Storage/Merge.php
+++ b/api/src/Storage/Merge.php
@@ -292,7 +292,7 @@ abstract class Merge
 		foreach($ignore_acl ? Customfields::get('addressbook', true) : $this->contacts->customfields as $name => $field)
 		{
 			$name = '#'.$name;
-			if(!$contact[$name])
+			if(!array_key_exists($name, $contact) || !$contact[$name])
 			{
 				$replacements['$$'.($prefix ? $prefix.'/':'').$name.'$$'] = '';
 				continue;