diff --git a/includes/SpecialConflictTestPage/SpecialConflictTestPage.php b/includes/SpecialConflictTestPage/SpecialConflictTestPage.php
index fa536d7..80a5420 100644
--- a/includes/SpecialConflictTestPage/SpecialConflictTestPage.php
+++ b/includes/SpecialConflictTestPage/SpecialConflictTestPage.php
@@ -56,6 +56,13 @@ public function execute( $subPage ) {
 		}
 
 		$testArticle = Article::newFromTitle( $testTitle, $this->getContext() );
+
+		if ( !$testArticle->getContentHandler()->supportsDirectEditing() ) {
+			$this->showWarningBox( 'twoColConflict-test-contentModel-noEditing' );
+			$this->showLoadTitle();
+			return;
+		}
+
 		if ( $request->getVal( 'mw-twocolconflict-test-text' ) === null ) {
 			$this->showHintBox( ( new Message( 'twoColConflict-test-edit-hint' ) )->parse() );

"error": {
  "code": "wikibase-no-direct-editing",
  "info": "Direct editing is disabled in namespace "
}