diff --git a/phpBB/assets/javascript/core.js b/phpBB/assets/javascript/core.js
index ba76ba8c10..1a8beb8224 100644
--- a/phpBB/assets/javascript/core.js
+++ b/phpBB/assets/javascript/core.js
@@ -681,6 +681,10 @@ phpbb.applyCodeEditor = function(textarea) {
 		startTagsEnd = ']',
 		endTags = ['[/code]'];
 
+	if (!textarea || typeof textarea.selectionStart !== 'number') {
+		return;
+	}
+
 	if ($(textarea).data('code-editor') === true) {
 		return;
 	}
diff --git a/phpBB/styles/prosilver/template/editor.js b/phpBB/styles/prosilver/template/editor.js
index 6eb8c1e0c4..235cc0025b 100644
--- a/phpBB/styles/prosilver/template/editor.js
+++ b/phpBB/styles/prosilver/template/editor.js
@@ -415,9 +415,6 @@ function getCaretPosition(txtarea) {
 		}
 
 		textarea = doc.forms[form_name].elements[text_name];
-		if (!textarea || typeof textarea.selectionStart !== 'number') {
-			return;
-		}
 
 		phpbb.applyCodeEditor(textarea);
 	});