fixes #43

src/larvatagger.js

@@ -73,7 +73,11 @@ const LarvaTagger = (function () {
 	function insertNewTag(table, html) {
 		const frag = document.createRange().createContextualFragment(html);
 		const newtr = frag.firstChild.firstChild.firstChild;
-		const tbody = table.getElementsByTagName('tbody')[0];
+		let tbody = table.getElementsByTagName('tbody')[0];
+		if (tbody == null) {
+			tbody = document.createElement('tbody');
+			table.appendChild(tbody);
+		}
 		tbody.appendChild(newtr);
 		newtr.scrollIntoView();
 	}