diff --git a/ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketEvent.java b/ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketEvent.java
index 97bc9fb1..6a0e8530 100644
--- a/ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketEvent.java
+++ b/ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketEvent.java
@@ -28,11 +28,28 @@ import org.bukkit.event.Cancellable;
 
 import com.comphenix.protocol.Application;
 import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
 import com.comphenix.protocol.async.AsyncMarker;
+import com.comphenix.protocol.error.Report;
+import com.comphenix.protocol.error.ReportType;
 import com.google.common.base.Objects;
 import com.google.common.base.Preconditions;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.Multimaps;
+import com.google.common.collect.SetMultimap;
 
+/**
+ * Represents a packet sending or receiving event. Changes to the packet will be 
+ * reflected in the final version to be sent or received. It is also possible to cancel an event.
+ * @author Kristian
+ */
 public class PacketEvent extends EventObject implements Cancellable {
+	public static final ReportType REPORT_CHANGING_PACKET_TYPE_IS_CONFUSING = new ReportType(
+			"Plugin %s changed packet type from %s to %s in packet listener. This is confusing for other plugins! (Not an error, though!)");
+	
+	private static final SetMultimap<PacketType, PacketType> CHANGE_WARNINGS = 
+			Multimaps.synchronizedSetMultimap(HashMultimap.<PacketType, PacketType>create());
+	
 	/**
 	 * Automatically generated by Eclipse.
 	 */
@@ -170,8 +187,19 @@ public class PacketEvent extends EventObject implements Cancellable {
 			throw new IllegalStateException("The packet event is read-only.");
 		if (packet == null)
 			throw new IllegalArgumentException("Cannot set packet to NULL. Use setCancelled() instead.");
-		if (this.packet != null && !Objects.equal(this.packet.getType(), packet.getType()))
-			throw new IllegalArgumentException("Cannot change packet type from " + this.packet.getType() + " to " + packet.getType());
+		
+		// Change warnings
+		final PacketType oldType = this.packet.getType();
+		final PacketType newType = packet.getType();
+		if (this.packet != null && !Objects.equal(oldType, newType)) {
+			// Only report this once
+			if (CHANGE_WARNINGS.put(oldType, newType)) {
+				ProtocolLibrary.getErrorReporter().reportWarning(this, 
+						Report.newBuilder(REPORT_CHANGING_PACKET_TYPE_IS_CONFUSING).
+						messageParam(oldType, newType).
+						build());
+			}
+		}
 		this.packet = packet;
 	}