diff --git a/database.sql b/database.sql
index f184f66819..813c14a994 100644
--- a/database.sql
+++ b/database.sql
@@ -506,6 +506,7 @@ CREATE TABLE IF NOT EXISTS `channel` (
 	`media-type` smallint unsigned COMMENT 'Filtered media types',
 	`languages` mediumtext COMMENT 'Desired languages',
 	`publish` boolean COMMENT 'publish channel content',
+	`valid` boolean COMMENT 'Set, when the full-text-search is valid',
 	 PRIMARY KEY(`id`),
 	 INDEX `uid` (`uid`),
 	FOREIGN KEY (`uid`) REFERENCES `user` (`uid`) ON UPDATE RESTRICT ON DELETE CASCADE
diff --git a/doc/database/db_channel.md b/doc/database/db_channel.md
index afd65b867c..5b0636dc80 100644
--- a/doc/database/db_channel.md
+++ b/doc/database/db_channel.md
@@ -20,6 +20,7 @@ Fields
 | media-type       | Filtered media types                                                                              | smallint unsigned  | YES  |     | NULL    |                |
 | languages        | Desired languages                                                                                 | mediumtext         | YES  |     | NULL    |                |
 | publish          | publish channel content                                                                           | boolean            | YES  |     | NULL    |                |
+| valid            | Set, when the full-text-search is valid                                                           | boolean            | YES  |     | NULL    |                |
 
 Indexes
 ------------
diff --git a/src/Content/Conversation/Entity/Timeline.php b/src/Content/Conversation/Entity/Timeline.php
index 175971a583..cbb2862eb5 100644
--- a/src/Content/Conversation/Entity/Timeline.php
+++ b/src/Content/Conversation/Entity/Timeline.php
@@ -64,8 +64,10 @@ class Timeline extends \Friendica\BaseEntity
 	protected $languages;
 	/** @var bool */
 	protected $publish;
+	/** @var bool */
+	protected $valid;
 
-	public function __construct(string $code = null, string $label = null, string $description = null, string $accessKey = null, string $path = null, int $uid = null, string $includeTags = null, string $excludeTags = null, string $fullTextSearch = null, int $mediaType = null, int $circle = null, array $languages = null, bool $publish = null)
+	public function __construct(string $code = null, string $label = null, string $description = null, string $accessKey = null, string $path = null, int $uid = null, string $includeTags = null, string $excludeTags = null, string $fullTextSearch = null, int $mediaType = null, int $circle = null, array $languages = null, bool $publish = null, bool $valid = null)
 	{
 		$this->code           = $code;
 		$this->label          = $label;
@@ -80,5 +82,6 @@ class Timeline extends \Friendica\BaseEntity
 		$this->circle         = $circle;
 		$this->languages      = $languages;
 		$this->publish        = $publish;
+		$this->valid          = $valid;
 	}
 }
diff --git a/src/Content/Conversation/Factory/UserDefinedChannel.php b/src/Content/Conversation/Factory/UserDefinedChannel.php
index d4798cd6c7..08a092205c 100644
--- a/src/Content/Conversation/Factory/UserDefinedChannel.php
+++ b/src/Content/Conversation/Factory/UserDefinedChannel.php
@@ -51,6 +51,7 @@ final class UserDefinedChannel extends Timeline implements ICanCreateFromTableRo
 			$row['circle'] ?? null,
 			$row['languages'] ?? null,
 			$row['publish'] ?? null,
+			$row['valid'] ?? null,
 		);
 	}
 }
diff --git a/src/Content/Conversation/Repository/UserDefinedChannel.php b/src/Content/Conversation/Repository/UserDefinedChannel.php
index e7b32255fe..bb8ad02f6b 100644
--- a/src/Content/Conversation/Repository/UserDefinedChannel.php
+++ b/src/Content/Conversation/Repository/UserDefinedChannel.php
@@ -134,6 +134,7 @@ class UserDefinedChannel extends \Friendica\BaseRepository
 			'media-type'       => $Channel->mediaType,
 			'languages'        => serialize($Channel->languages),
 			'publish'          => $Channel->publish,
+			'valid'            => $this->isValid($Channel->fullTextSearch),
 		];
 
 		if ($Channel->code) {
@@ -149,6 +150,18 @@ class UserDefinedChannel extends \Friendica\BaseRepository
 		return $Channel;
 	}
 
+	private function isValid(string $searchtext): bool
+	{
+		if ($searchtext == '') {
+			return true;
+		}
+
+		$this->db->insert('check-full-text-search', ['pid' => getmypid(), 'searchtext' => $searchtext], Database::INSERT_UPDATE);
+		$result = $this->db->select('check-full-text-search', [], ["`pid` = ? AND MATCH (`searchtext`) AGAINST (? IN BOOLEAN MODE)", getmypid(), $this->escapeKeywords($searchtext)]);
+		$this->db->delete('check-full-text-search', ['pid' => getmypid()]);
+		return $result !== false;
+	}
+
 	/**
 	 * Checks, if one of the user defined channels matches with the given search text
 	 * @todo Combine all the full text statements in a single search text to improve the performance.
@@ -214,7 +227,7 @@ class UserDefinedChannel extends \Friendica\BaseRepository
 
 		$uids = [];
 
-		$condition = ['uid' => $channelUids];
+		$condition = ['uid' => $channelUids, 'valid' => true];
 		if (!$relayMode) {
 			$condition = DBA::mergeConditions($condition, ["`full-text-search` != ?", '']);
 		} else {
@@ -298,11 +311,16 @@ class UserDefinedChannel extends \Friendica\BaseRepository
 	}
 
 	private function inFulltext(string $fullTextSearch): bool
+	{
+		return $this->db->exists('check-full-text-search', ["`pid` = ? AND MATCH (`searchtext`) AGAINST (? IN BOOLEAN MODE)", getmypid(), $this->escapeKeywords($fullTextSearch)]);
+	}
+
+	private function escapeKeywords(string $fullTextSearch): string
 	{
 		foreach (Engagement::KEYWORDS as $keyword) {
 			$fullTextSearch = preg_replace('~(' . $keyword . ':.[\w@\.-]+)~', '"$1"', $fullTextSearch);
 		}
-		return $this->db->exists('check-full-text-search', ["`pid` = ? AND MATCH (`searchtext`) AGAINST (? IN BOOLEAN MODE)", getmypid(), $fullTextSearch]);
+		return $fullTextSearch;
 	}
 
 	private function getUserCondition()
diff --git a/static/dbstructure.config.php b/static/dbstructure.config.php
index ded1295adf..cb5ea1c23f 100644
--- a/static/dbstructure.config.php
+++ b/static/dbstructure.config.php
@@ -564,6 +564,7 @@ return [
 			"media-type" => ["type" => "smallint unsigned", "comment" => "Filtered media types"],
 			"languages" => ["type" => "mediumtext", "comment" => "Desired languages"],
 			"publish" => ["type" => "boolean", "comment" => "publish channel content"],
+			"valid" => ["type" => "boolean", "comment" => "Set, when the full-text-search is valid"],
 		],
 		"indexes" => [
 			"PRIMARY" => ["id"],