diff --git a/runelite-client/src/main/java/net/runelite/client/game/chatbox/ChatboxTextInput.java b/runelite-client/src/main/java/net/runelite/client/game/chatbox/ChatboxTextInput.java
index c8b1a3e846..2bc0bfde5b 100644
--- a/runelite-client/src/main/java/net/runelite/client/game/chatbox/ChatboxTextInput.java
+++ b/runelite-client/src/main/java/net/runelite/client/game/chatbox/ChatboxTextInput.java
@@ -51,6 +51,7 @@ import net.runelite.api.widgets.WidgetTextAlignment;
 import net.runelite.client.callback.ClientThread;
 import net.runelite.client.input.KeyListener;
 import net.runelite.client.input.MouseListener;
+import net.runelite.client.util.Text;
 
 @Slf4j
 public class ChatboxTextInput extends ChatboxInput implements KeyListener, MouseListener
@@ -233,9 +234,9 @@ public class ChatboxTextInput extends ChatboxInput implements KeyListener, Mouse
 	{
 		Widget container = chatboxPanelManager.getContainerWidget();
 
-		String lt = value.substring(0, this.cursor);
-		String mt = value.substring(this.cursor, this.cursorEnd);
-		String rt = value.substring(this.cursorEnd);
+		String lt = Text.escapeJagex(value.substring(0, this.cursor));
+		String mt = Text.escapeJagex(value.substring(this.cursor, this.cursorEnd));
+		String rt = Text.escapeJagex(value.substring(this.cursorEnd));
 
 		Widget leftText = container.createChild(-1, WidgetType.TEXT);
 		Widget cursor = container.createChild(-1, WidgetType.RECTANGLE);
@@ -332,9 +333,9 @@ public class ChatboxTextInput extends ChatboxInput implements KeyListener, Mouse
 			// `i` is used to track max execution time incase there is a font with ligature width data that causes this to fail
 			for (int i = tsValue.length(); i >= 0 && charIndex >= 0 && charIndex <= tsValue.length(); i--)
 			{
-				int lcx = charIndex > 0 ? font.getTextWidth(tsValue.substring(0, charIndex - 1)) : 0;
-				int mcx = font.getTextWidth(tsValue.substring(0, charIndex));
-				int rcx = charIndex + 1 <= tsValue.length() ? font.getTextWidth(tsValue.substring(0, charIndex + 1)) : mcx;
+				int lcx = charIndex > 0 ? font.getTextWidth(Text.escapeJagex(tsValue.substring(0, charIndex - 1))) : 0;
+				int mcx = font.getTextWidth(Text.escapeJagex(tsValue.substring(0, charIndex)));
+				int rcx = charIndex + 1 <= tsValue.length() ? font.getTextWidth(Text.escapeJagex(tsValue.substring(0, charIndex + 1))) : mcx;
 
 				int leftBound = (lcx + mcx) / 2;
 				int rightBound = (mcx + rcx) / 2;
diff --git a/runelite-client/src/main/java/net/runelite/client/util/Text.java b/runelite-client/src/main/java/net/runelite/client/util/Text.java
index 72be89f3b4..9f73e947a6 100644
--- a/runelite-client/src/main/java/net/runelite/client/util/Text.java
+++ b/runelite-client/src/main/java/net/runelite/client/util/Text.java
@@ -36,10 +36,10 @@ public class Text
 	private static final Pattern TAG_REGEXP = Pattern.compile("<[^>]*>");
 
 	/**
-	 * Removes all tags from the given `str`.
+	 * Removes all tags from the given string.
 	 *
 	 * @param str The string to remove tags from.
-	 * @return The given `str` with all tags removed from it.
+	 * @return The given string with all tags removed from it.
 	 */
 	public static String removeTags(String str)
 	{
@@ -70,7 +70,7 @@ public class Text
 	}
 
 	/**
-	 * In addition to removing all tags, replaces all <br> delimited text with spaces and all multiple continuous
+	 * In addition to removing all tags, replaces all &lt;br&gt; delimited text with spaces and all multiple continuous
 	 * spaces with single space
 	 *
 	 * @param str The string to sanitize
@@ -83,4 +83,35 @@ public class Text
 			.replaceAll("<br>", " ")
 			.replaceAll("[ ]+", " "));
 	}
+
+	/**
+	 * Escapes a string for widgets, replacing &lt; and &gt; with their escaped counterparts
+	 */
+	public static String escapeJagex(String str)
+	{
+		StringBuilder out = new StringBuilder(str.length());
+
+		for (int i = 0; i < str.length(); i++)
+		{
+			char c = str.charAt(i);
+			if (c == '<')
+			{
+				out.append("<lt>");
+			}
+			else if (c == '>')
+			{
+				out.append("<gt>");
+			}
+			else if (c == '\n')
+			{
+				out.append("<br>");
+			}
+			else if (c != '\r')
+			{
+				out.append(c);
+			}
+		}
+
+		return out.toString();
+	}
 }
diff --git a/runelite-mixins/src/main/java/net/runelite/mixins/ScriptVMMixin.java b/runelite-mixins/src/main/java/net/runelite/mixins/ScriptVMMixin.java
index 7293f9daa1..29f632576a 100644
--- a/runelite-mixins/src/main/java/net/runelite/mixins/ScriptVMMixin.java
+++ b/runelite-mixins/src/main/java/net/runelite/mixins/ScriptVMMixin.java
@@ -119,7 +119,14 @@ public abstract class ScriptVMMixin implements RSClient
 		Object[] arguments = event.getArguments();
 		if (arguments != null && arguments.length > 0 && arguments[0] instanceof JavaScriptCallback)
 		{
-			((JavaScriptCallback) arguments[0]).run(event);
+			try
+			{
+				((JavaScriptCallback) arguments[0]).run(event);
+			}
+			catch (Exception e)
+			{
+				client.getLogger().error("Error in JavaScriptCallback", e);
+			}
 			return;
 		}