diff --git a/src/Models/AbstractCrudModel.php b/src/Models/AbstractCrudModel.php
index 20d107fc..53ea77d4 100644
--- a/src/Models/AbstractCrudModel.php
+++ b/src/Models/AbstractCrudModel.php
@@ -40,7 +40,7 @@ abstract class AbstractCrudModel implements IModel
 		$stmt = new SqlSelectStatement();
 		$stmt->setColumn('*');
 		$stmt->setTable(static::getTableName());
-		$stmt->setCriterion(SqlInOperator::fromArray('id', SqlBinding::fromArray($ids)));
+		$stmt->setCriterion(SqlInOperator::fromArray('id', SqlBinding::fromArray(array_unique($ids))));
 
 		$rows = Database::fetchAll($stmt);
 		if ($rows)
diff --git a/src/Models/PostModel.php b/src/Models/PostModel.php
index 848f1788..399373dd 100644
--- a/src/Models/PostModel.php
+++ b/src/Models/PostModel.php
@@ -187,7 +187,7 @@ class PostModel extends AbstractCrudModel
 			$postMap[$postId] = $post;
 			$tagsMap[$postId] = [];
 		}
-		$postIds = array_keys($postMap);
+		$postIds = array_unique(array_keys($postMap));
 
 		$stmt = new SqlSelectStatement();
 		$stmt->setTable('tag');
@@ -213,9 +213,7 @@ class PostModel extends AbstractCrudModel
 		}
 
 		foreach ($tagsMap as $postId => $tags)
-		{
 			$postMap[$postId]->setCache('tags', $tags);
-		}
 	}