Fix: front-end errors

Author: veniware

Protest/Front/ipbox.js

@@ -65,7 +65,7 @@ class IpBox {
 
 				if (event.target.selectionStart === 0 && event.target.selectionEnd === 4) {
 					let v = parseInt(event.target.value);
-					if (v === NaN) v = 0;
+					if (isNaN(v)) v = 0;
 					if (v > 255) event.target.value = 255;
 					if (!isNaN(event.key)) this.FocusNext(event.target);
 				}

Protest/Front/monitor.js

@@ -1763,6 +1763,13 @@ class Monitor extends Window {
 
 			if (options.isComplement) { value = max - value; }
 
+			if (last === null) {
+				last = value;
+				return;
+			}
+
+			let delta = value - last;
+
 			if (valley > delta) { valley = delta; }
 			if (peak < delta) { peak = delta; }
 
@@ -1771,13 +1778,6 @@ class Monitor extends Window {
 				max = peak * 1.05;
 			}
 
-			if (last === null) {
-				last = value;
-				return;
-			}
-
-			let delta = value - last;
-
 			if (list.length * gap > canvas.width) list.shift();
 			list.push(delta);