diff --git a/phpBB/phpbb/db/migration/data/v32x/merge_duplicate_bbcodes.php b/phpBB/phpbb/db/migration/data/v32x/merge_duplicate_bbcodes.php
index b1ee241f44..71ee19e3dd 100644
--- a/phpBB/phpbb/db/migration/data/v32x/merge_duplicate_bbcodes.php
+++ b/phpBB/phpbb/db/migration/data/v32x/merge_duplicate_bbcodes.php
@@ -46,16 +46,25 @@ class merge_duplicate_bbcodes extends \phpbb\db\migration\container_aware_migrat
 
 	protected function merge_bbcodes(array $without, array $with)
 	{
-		$merged = $this->container->get('text_formatter.s9e.bbcode_merger')->merge_bbcodes(
-			[
-				'usage'    => $without['bbcode_match'],
-				'template' => $without['bbcode_tpl']
-			],
-			[
-				'usage'    => $with['bbcode_match'],
-				'template' => $with['bbcode_tpl']
-			]
-		);
+		try
+		{
+			$merged = $this->container->get('text_formatter.s9e.bbcode_merger')->merge_bbcodes(
+				[
+					'usage'    => $without['bbcode_match'],
+					'template' => $without['bbcode_tpl']
+				],
+				[
+					'usage'    => $with['bbcode_match'],
+					'template' => $with['bbcode_tpl']
+				]
+			);
+		}
+		catch (\Exception $e)
+		{
+			// Ignore the pair and move on. The BBCodes would have to be fixed manually
+			return;
+		}
+
 		$bbcode_data = [
 			'bbcode_tag'      => $without['bbcode_tag'],
 			'bbcode_helpline' => $without['bbcode_helpline'] . ' | ' . $with['bbcode_helpline'],
diff --git a/phpBB/phpbb/textformatter/s9e/bbcode_merger.php b/phpBB/phpbb/textformatter/s9e/bbcode_merger.php
index 72b1473751..a05ca3c2b8 100644
--- a/phpBB/phpbb/textformatter/s9e/bbcode_merger.php
+++ b/phpBB/phpbb/textformatter/s9e/bbcode_merger.php
@@ -37,6 +37,9 @@ class bbcode_merger
 	*
 	* All of the arrays contain a "usage" element and a "template" element
 	*
+	* @throws InvalidArgumentException if a definition cannot be interpreted
+	* @throws RuntimeException if something unexpected occurs
+	*
 	* @param  array $without BBCode definition without an attribute
 	* @param  array $with    BBCode definition with an attribute
 	* @return array          Merged definition