diff --git a/modules/comment/comment.controller.php b/modules/comment/comment.controller.php
index 04c515197..05a3b0e90 100644
--- a/modules/comment/comment.controller.php
+++ b/modules/comment/comment.controller.php
@@ -1716,6 +1716,12 @@ class CommentController extends Comment
 			$output->add('blamed_count', $trigger_obj->after_point);
 		}
 
+		// Prevent session data getting too large
+		if (count($_SESSION['voted_comment']) > 200)
+		{
+			$_SESSION['voted_comment'] = array_slice($_SESSION['voted_comment'], 100, null, true);
+		}
+
 		return $output;
 	}
 
@@ -1875,6 +1881,12 @@ class CommentController extends Comment
 		// leave into the session information
 		$_SESSION['declared_comment'][$comment_srl] = TRUE;
 
+		// Prevent session data getting too large
+		if (count($_SESSION['declared_comment']) > 200)
+		{
+			$_SESSION['declared_comment'] = array_slice($_SESSION['declared_comment'], 100, null, true);
+		}
+
 		$this->setMessage('success_declared');
 	}
 
diff --git a/modules/comment/comment.item.php b/modules/comment/comment.item.php
index 096a2f887..63a8369a1 100644
--- a/modules/comment/comment.item.php
+++ b/modules/comment/comment.item.php
@@ -241,6 +241,10 @@ class CommentItem extends BaseObject
 		{
 			$_SESSION['accessible'][$this->comment_srl] = $this->get('last_update');
 		}
+		if(is_array($_SESSION['accessible']) && count($_SESSION['accessible']) > 200)
+		{
+			$_SESSION['accessible'] = array_slice($_SESSION['accessible'], 100, null, true);
+		}
 	}
 
 	function isEditable()
diff --git a/modules/document/document.controller.php b/modules/document/document.controller.php
index e0fdd3008..f30f879c9 100644
--- a/modules/document/document.controller.php
+++ b/modules/document/document.controller.php
@@ -1719,6 +1719,12 @@ class DocumentController extends Document
 			$_SESSION['readed_document'][$document_srl] = true;
 		}
 
+		// Prevent session data getting too large
+		if (is_array($_SESSION['readed_document']) && count($_SESSION['readed_document']) > 1000)
+		{
+			$_SESSION['readed_document'] = array_slice($_SESSION['readed_document'], 500, null, true);
+		}
+
 		return TRUE;
 	}
 
@@ -2105,6 +2111,12 @@ class DocumentController extends Document
 			$output->add('blamed_count', $trigger_obj->after_point);
 		}
 
+		// Prevent session data getting too large
+		if (count($_SESSION['voted_document']) > 200)
+		{
+			$_SESSION['voted_document'] = array_slice($_SESSION['voted_document'], 100, null, true);
+		}
+
 		return $output;
 	}
 
@@ -2264,6 +2276,12 @@ class DocumentController extends Document
 		// Leave in the session information
 		$_SESSION['declared_document'][$document_srl] = true;
 
+		// Prevent session data getting too large
+		if (count($_SESSION['declared_document']) > 200)
+		{
+			$_SESSION['declared_document'] = array_slice($_SESSION['declared_document'], 100, null, true);
+		}
+
 		$this->setMessage('success_declared');
 	}
 
diff --git a/modules/document/document.item.php b/modules/document/document.item.php
index 36fdf4c09..35b49ded3 100644
--- a/modules/document/document.item.php
+++ b/modules/document/document.item.php
@@ -285,6 +285,10 @@ class DocumentItem extends BaseObject
 		{
 			$_SESSION['accessible'][$this->document_srl] = $this->get('last_update');
 		}
+		if(is_array($_SESSION['accessible']) && count($_SESSION['accessible']) > 200)
+		{
+			$_SESSION['accessible'] = array_slice($_SESSION['accessible'], 100, null, true);
+		}
 	}
 
 	function allowComment()
diff --git a/modules/file/file.controller.php b/modules/file/file.controller.php
index 915ddf64b..886f5fba2 100644
--- a/modules/file/file.controller.php
+++ b/modules/file/file.controller.php
@@ -772,6 +772,10 @@ class FileController extends File
 		{
 			$_SESSION['upload_info'] = array();
 		}
+		if(count($_SESSION['upload_info']) > 200)
+		{
+			$_SESSION['upload_info'] = array_slice($_SESSION['upload_info'], 100, null, true);
+		}
 		if(!isset($_SESSION['upload_info'][$editor_sequence]))
 		{
 			$_SESSION['upload_info'][$editor_sequence] = new stdClass();