Guard against undefined event.target and this in linkState callback.

Author: pl12133

src/index.js

@@ -14,7 +14,7 @@ export default function linkState(component, key, eventPath) {
 		let t = e && e.target || this,
 			state = {},
 			obj = state,
-			v = typeof eventPath==='string' ? delve(e, eventPath) : t.nodeName ? (t.type.match(/^che|rad/) ? t.checked : t.value) : e,
+			v = typeof eventPath==='string' ? delve(e, eventPath) : (t && t.nodeName) ? (t.type.match(/^che|rad/) ? t.checked : t.value) : e,
 			i = 0;
 		for ( ; i<path.length-1; i++) {
 			obj = obj[path[i]] || (obj[path[i]] = !i && component.state[path[i]] || {});