diff --git a/extensions/copilot/src/extension/inlineChat/vscode-node/inlineChatCodeActions.ts b/extensions/copilot/src/extension/inlineChat/vscode-node/inlineChatCodeActions.ts
index 6edcc1931b2..01669872748 100644
--- a/extensions/copilot/src/extension/inlineChat/vscode-node/inlineChatCodeActions.ts
+++ b/extensions/copilot/src/extension/inlineChat/vscode-node/inlineChatCodeActions.ts
@@ -136,6 +136,9 @@ export class QuickFixesProvider implements vscode.CodeActionProvider {
 	}
 
 	private provideAltTextQuickFix(document: vscode.TextDocument, range: vscode.Range): ImageCodeAction | undefined {
+		if (range.start.line < 0 || range.start.line >= document.lineCount) {
+			return;
+		}
 		const currentLine = document.lineAt(range.start.line).text;
 		const generateImagePath = extractImageAttributes(currentLine);
 		const refineImagePath = extractImageAttributes(currentLine, true);