make it works again

main.ts

@@ -19,7 +19,7 @@ export default class PAUL extends Plugin {
 		if (activeFile && activeFile.extension === 'md') {
 			this.app.vault.read(activeFile).then(content => {
 				const pattern = /Modified: \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z/;
-				let digit = (inp)=>{ return String(inp).padStart(2, '0') }
+				const digit = (inp: number)=>{ return String(inp).padStart(2, '0') }
 				const t = new Date()
 				const modified = `Modified: ${t.getFullYear()}-${digit(t.getMonth()+1)}-${digit(t.getDate())}T${digit(t.getHours())}:${digit(t.getMinutes())}:${digit(t.getSeconds())}Z`;
 
@@ -32,6 +32,10 @@ export default class PAUL extends Plugin {
 					const analysis = content.match(/^---\n((?!-{3})(?:(?:.+:.*)|(?:\s{2}-\s.+))\n)+---/);
 					// const analysis = content.match(/---\n(.*:.*\n)*---/s);
 					// console.log(analysis);
+					// frontmatter가 없으면 삽입할 위치를 찾을 수 없으므로 중단
+					if (!analysis || analysis.index === undefined) {
+						return;
+					}
 					const pnt = analysis.index + analysis[0].length - 3;
 					this.app.vault.modify(activeFile, content.slice(0, pnt) + modified + '\n' + content.slice(pnt));
 				}