diff --git a/dist/dde-with-signals.js b/dist/dde-with-signals.js
index 533a6fa..31d3a98 100644
--- a/dist/dde-with-signals.js
+++ b/dist/dde-with-signals.js
@@ -52,7 +52,7 @@
 		let r = N(this), o;
 		switch (r.isTextContent(t) && (t = { textContent: t }), !0) {
 			case typeof e == "function": {
-				o = e(t || void 0, (i) => i ? (n.unshift(i), void 0) : o);
+				o = e(t || void 0, (s) => s ? (n.unshift(s), void 0) : o);
 				break;
 			}
 			case e === "#text":
@@ -75,39 +75,39 @@
 		if (!t.length)
 			return e;
 		let r = e instanceof SVGElement, o = (r ? I : T).bind(null, e, "Attribute");
-		return Object.entries(Object.assign({}, ...t)).forEach(function a([i, s]) {
-			s = n.processReactiveAttribute(e, i, s, a);
-			let [h] = i;
+		return Object.entries(Object.assign({}, ...t)).forEach(function a([s, i]) {
+			i = n.processReactiveAttribute(e, s, i, a);
+			let [h] = s;
 			if (h === "=")
-				return o(i.slice(1), s);
+				return o(s.slice(1), i);
 			if (h === ".")
-				return M(e, i.slice(1), s);
-			if (typeof s == "object")
-				switch (i) {
+				return M(e, s.slice(1), i);
+			if (typeof i == "object" && i !== null)
+				switch (s) {
 					case "style":
-						return O(s, T.bind(null, e.style, "Property"));
+						return O(i, T.bind(null, e.style, "Property"));
 					case "dataset":
-						return O(s, M.bind(null, e.dataset));
+						return O(i, M.bind(null, e.dataset));
 					case "ariaset":
-						return O(s, (E, v) => o("aria-" + E, v));
+						return O(i, (E, v) => o("aria-" + E, v));
 					case "classList":
-						return J(e, s);
+						return J(e, i);
 					default:
-						return Reflect.set(e, i, s);
+						return Reflect.set(e, s, i);
 				}
-			if (/(aria|data)([A-Z])/.test(i))
-				return i = i.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase(), o(i, s);
-			switch (i) {
+			if (/(aria|data)([A-Z])/.test(s))
+				return s = s.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase(), o(s, i);
+			switch (s) {
 				case "href":
-					return o(i, s);
+					return o(s, i);
 				case "xlink:href":
-					return o(i, s, "http://www.w3.org/1999/xlink");
+					return o(s, i, "http://www.w3.org/1999/xlink");
 				case "textContent":
 					if (!r)
 						break;
-					return e.appendChild(document.createTextNode(s));
+					return e.appendChild(document.createTextNode(i));
 			}
-			return W(e, i) ? q(e, i, s) : o(i, s);
+			return W(e, s) ? q(e, s, i) : o(s, i);
 		}), e;
 	}
 	function J(e, t) {
@@ -126,8 +126,8 @@
 		let r = e.nodeName + "," + t;
 		if (x.has(r))
 			return x.get(r);
-		let [o, a, i] = H(e, t), s = !m(o.set);
-		return (!s || a) && x.set(i === HTMLElement.prototype ? n : r, s), s;
+		let [o, a, s] = H(e, t), i = !m(o.set);
+		return (!i || a) && x.set(s === HTMLElement.prototype ? n : r, i), i;
 	}
 	function H(e, t, n = 0) {
 		if (e = Object.getPrototypeOf(e), !e)
@@ -175,10 +175,10 @@
 			for (let f of c)
 				if (f.type === "childList") {
 					if (E(f.addedNodes, !0)) {
-						i();
+						s();
 						continue;
 					}
-					v(f.removedNodes, !0) && i();
+					v(f.removedNodes, !0) && s();
 				}
 		});
 		return {
@@ -202,7 +202,7 @@
 			}
 		};
 		function r(c, f) {
-			f.connected.length || f.disconnected.length || (e.delete(c), i());
+			f.connected.length || f.disconnected.length || (e.delete(c), s());
 		}
 		function o(c) {
 			if (e.has(c))
@@ -213,16 +213,16 @@
 		function a() {
 			t || (t = !0, n.observe(document.body, { childList: !0, subtree: !0 }));
 		}
-		function i() {
+		function s() {
 			!t || e.size || (t = !1, n.disconnect());
 		}
-		function s() {
+		function i() {
 			return new Promise(function(c) {
 				(requestIdleCallback || requestAnimationFrame)(c);
 			});
 		}
 		async function h(c) {
-			e.size > 30 && await s();
+			e.size > 30 && await i();
 			let f = [];
 			if (!(c instanceof Node))
 				return f;
@@ -314,15 +314,15 @@
 	g.el = function(e, t) {
 		let n = document.createComment("<#reactive>"), r = document.createComment("</#reactive>"), o = document.createDocumentFragment();
 		o.append(n, r);
-		let a = (i) => {
+		let a = (s) => {
 			if (!n.parentNode || !r.parentNode)
 				return $(e, a);
-			let s = t(i);
-			Array.isArray(s) || (s = [s]);
+			let i = t(s);
+			Array.isArray(i) || (i = [i]);
 			let h = n;
 			for (; (h = n.nextSibling) !== r; )
 				h.remove();
-			n.after(...s);
+			n.after(...i);
 		};
 		return P(e, a), a(e()), o;
 	};
diff --git a/dist/dde.js b/dist/dde.js
index 477f13d..b1e98b9 100644
--- a/dist/dde.js
+++ b/dist/dde.js
@@ -78,7 +78,7 @@
 				return c(s.slice(1), f);
 			if (h === ".")
 				return y(e, s.slice(1), f);
-			if (typeof f == "object")
+			if (typeof f == "object" && f !== null)
 				switch (s) {
 					case "style":
 						return m(f, N.bind(null, e.style, "Property"));
diff --git a/dist/esm-with-signals.js b/dist/esm-with-signals.js
index 10a4a94..bfc9989 100644
--- a/dist/esm-with-signals.js
+++ b/dist/esm-with-signals.js
@@ -50,7 +50,7 @@ function ie(e, t, ...n) {
 	let r = N(this), o;
 	switch (r.isTextContent(t) && (t = { textContent: t }), !0) {
 		case typeof e == "function": {
-			o = e(t || void 0, (i) => i ? (n.unshift(i), void 0) : o);
+			o = e(t || void 0, (s) => s ? (n.unshift(s), void 0) : o);
 			break;
 		}
 		case e === "#text":
@@ -73,39 +73,39 @@ function y(e, ...t) {
 	if (!t.length)
 		return e;
 	let r = e instanceof SVGElement, o = (r ? I : T).bind(null, e, "Attribute");
-	return Object.entries(Object.assign({}, ...t)).forEach(function a([i, s]) {
-		s = n.processReactiveAttribute(e, i, s, a);
-		let [h] = i;
+	return Object.entries(Object.assign({}, ...t)).forEach(function a([s, i]) {
+		i = n.processReactiveAttribute(e, s, i, a);
+		let [h] = s;
 		if (h === "=")
-			return o(i.slice(1), s);
+			return o(s.slice(1), i);
 		if (h === ".")
-			return M(e, i.slice(1), s);
-		if (typeof s == "object")
-			switch (i) {
+			return M(e, s.slice(1), i);
+		if (typeof i == "object" && i !== null)
+			switch (s) {
 				case "style":
-					return O(s, T.bind(null, e.style, "Property"));
+					return O(i, T.bind(null, e.style, "Property"));
 				case "dataset":
-					return O(s, M.bind(null, e.dataset));
+					return O(i, M.bind(null, e.dataset));
 				case "ariaset":
-					return O(s, (E, v) => o("aria-" + E, v));
+					return O(i, (E, v) => o("aria-" + E, v));
 				case "classList":
-					return J(e, s);
+					return J(e, i);
 				default:
-					return Reflect.set(e, i, s);
+					return Reflect.set(e, s, i);
 			}
-		if (/(aria|data)([A-Z])/.test(i))
-			return i = i.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase(), o(i, s);
-		switch (i) {
+		if (/(aria|data)([A-Z])/.test(s))
+			return s = s.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase(), o(s, i);
+		switch (s) {
 			case "href":
-				return o(i, s);
+				return o(s, i);
 			case "xlink:href":
-				return o(i, s, "http://www.w3.org/1999/xlink");
+				return o(s, i, "http://www.w3.org/1999/xlink");
 			case "textContent":
 				if (!r)
 					break;
-				return e.appendChild(document.createTextNode(s));
+				return e.appendChild(document.createTextNode(i));
 		}
-		return W(e, i) ? q(e, i, s) : o(i, s);
+		return W(e, s) ? q(e, s, i) : o(s, i);
 	}), e;
 }
 function J(e, t) {
@@ -124,8 +124,8 @@ function W(e, t) {
 	let r = e.nodeName + "," + t;
 	if (x.has(r))
 		return x.get(r);
-	let [o, a, i] = H(e, t), s = !m(o.set);
-	return (!s || a) && x.set(i === HTMLElement.prototype ? n : r, s), s;
+	let [o, a, s] = H(e, t), i = !m(o.set);
+	return (!i || a) && x.set(s === HTMLElement.prototype ? n : r, i), i;
 }
 function H(e, t, n = 0) {
 	if (e = Object.getPrototypeOf(e), !e)
@@ -173,10 +173,10 @@ function Z() {
 		for (let f of c)
 			if (f.type === "childList") {
 				if (E(f.addedNodes, !0)) {
-					i();
+					s();
 					continue;
 				}
-				v(f.removedNodes, !0) && i();
+				v(f.removedNodes, !0) && s();
 			}
 	});
 	return {
@@ -200,7 +200,7 @@ function Z() {
 		}
 	};
 	function r(c, f) {
-		f.connected.length || f.disconnected.length || (e.delete(c), i());
+		f.connected.length || f.disconnected.length || (e.delete(c), s());
 	}
 	function o(c) {
 		if (e.has(c))
@@ -211,16 +211,16 @@ function Z() {
 	function a() {
 		t || (t = !0, n.observe(document.body, { childList: !0, subtree: !0 }));
 	}
-	function i() {
+	function s() {
 		!t || e.size || (t = !1, n.disconnect());
 	}
-	function s() {
+	function i() {
 		return new Promise(function(c) {
 			(requestIdleCallback || requestAnimationFrame)(c);
 		});
 	}
 	async function h(c) {
-		e.size > 30 && await s();
+		e.size > 30 && await i();
 		let f = [];
 		if (!(c instanceof Node))
 			return f;
@@ -312,15 +312,15 @@ g.clear = function(...e) {
 g.el = function(e, t) {
 	let n = document.createComment("<#reactive>"), r = document.createComment("</#reactive>"), o = document.createDocumentFragment();
 	o.append(n, r);
-	let a = (i) => {
+	let a = (s) => {
 		if (!n.parentNode || !r.parentNode)
 			return $(e, a);
-		let s = t(i);
-		Array.isArray(s) || (s = [s]);
+		let i = t(s);
+		Array.isArray(i) || (i = [i]);
 		let h = n;
 		for (; (h = n.nextSibling) !== r; )
 			h.remove();
-		n.after(...s);
+		n.after(...i);
 	};
 	return P(e, a), a(e()), o;
 };
diff --git a/dist/esm.js b/dist/esm.js
index 3384678..da9d312 100644
--- a/dist/esm.js
+++ b/dist/esm.js
@@ -76,7 +76,7 @@ function b(e, ...t) {
 			return c(s.slice(1), f);
 		if (h === ".")
 			return y(e, s.slice(1), f);
-		if (typeof f == "object")
+		if (typeof f == "object" && f !== null)
 			switch (s) {
 				case "style":
 					return m(f, N.bind(null, e.style, "Property"));
diff --git a/src/dom.js b/src/dom.js
index cd78d1f..14c88cf 100644
--- a/src/dom.js
+++ b/src/dom.js
@@ -43,19 +43,19 @@ export function assign(element, ...attributes){
 	const is_svg= element instanceof SVGElement;
 	const setRemoveAttr= (is_svg ? setRemoveNS : setRemove).bind(null, element, "Attribute");
 	
-	/* jshint maxcomplexity:16 */
+	/* jshint maxcomplexity:17 */
 	Object.entries(Object.assign({}, ...attributes)).forEach(function assignNth([ key, attr ]){
 		attr= s.processReactiveAttribute(element, key, attr, assignNth);
 		const [ k ]= key;
 		if("="===k) return setRemoveAttr(key.slice(1), attr);
 		if("."===k) return setDelete(element, key.slice(1), attr);
-		if(typeof attr === "object"){
+		if(typeof attr === "object" && attr!==null){
 			switch(key){
-				case "style":		return forEachEntries(attr, setRemove.bind(null, element.style, "Property"));
-				case "dataset":		return forEachEntries(attr, setDelete.bind(null, element.dataset));
-				case "ariaset":		return forEachEntries(attr, (key, val)=> setRemoveAttr("aria-"+key, val));
-				case "classList":	return classListDeclarative(element, attr);
-				default:			return Reflect.set(element, key, attr);
+				case     "style": return forEachEntries(attr, setRemove.bind(null, element.style, "Property"));
+				case   "dataset": return forEachEntries(attr, setDelete.bind(null, element.dataset));
+				case   "ariaset": return forEachEntries(attr, (key, val)=> setRemoveAttr("aria-"+key, val));
+				case "classList": return classListDeclarative(element, attr);
+				         default: return Reflect.set(element, key, attr);
 			}
 		}
 		if(/(aria|data)([A-Z])/.test(key)){