What steps will reproduce the problem?
1. Uncomment lines 107-119 in Editors/Document.java to re-enable cursor 
positions
2. Become host and share a file that already has some text (no other users 
needed)
3. Click anywhere in the file to generated a cursor FEU
4. Right-click on file in Shared Files and close shared file
5. Do something else as host, like share another file

** Null Pointer exception at this point, see below **


Please provide any additional information below.

*** Eclipse Application Output ***

!SESSION 2011-06-12 14:26:24.108 -----------------------------------------------
eclipse.buildId=M20110210-1200
java.version=1.6.0_24
java.vendor=Apple Inc.
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US
Framework arguments:  -product org.eclipse.sdk.ide
Command-line arguments:  -product org.eclipse.sdk.ide -data 
/Users/rvmiller89/eclipse/plugin_dev/../runtime-EclipseApplication -dev 
file:/Users/rvmiller89/eclipse/plugin_dev/.metadata/.plugins/org.eclipse.pde.cor
e/Eclipse Application/dev.properties -os macosx -ws cocoa -arch x86_64 
-consoleLog

!ENTRY org.eclipse.core.net 1 0 2011-06-12 14:26:33.920
!MESSAGE System property http.nonProxyHosts has been set to 
local|*.local|169.254/16|*.169.254/16 by an external source. This value will be 
overwritten using the values from the preferences
Received: FEU: NF | Type: Connection_Succeed | ASGN ID: 0

GetUpdate: FEU: NF | Type: Connection_Succeed | ASGN ID: 0
Sent: FEU: NF | Type: User_Connected | UID: 0 | UNAME: Ryan

Received: FEU: NF | Type: User_Connected | UID: 0 | UNAME: Ryan

Received: FEU: NF | Type: User_Connected | UID: 0 | UNAME: Ryan

GetUpdate: FEU: NF | Type: User_Connected | UID: 0 | UNAME: Ryan
Received: FEU: NF | Type: New_Host | UID: -1 | FID: -1 | CONTENT:  | 

GetUpdate: FEU: NF | Type: User_Connected | UID: 0 | UNAME: Ryan
GetUpdate: FEU: NF | Type: New_Host | UID: -1 | FID: -1 | CONTENT:  | 
Sent: FEU: NF | Type: Request_Host | UID: 0 | FID: -1 | CONTENT: Ryan | 

Received: FEU: NF | Type: New_Host | UID: 0 | FID: -1 | CONTENT:  | 

GetUpdate: FEU: NF | Type: New_Host | UID: 0 | FID: -1 | CONTENT:  | 
Sent: FEU: NF | Type: New_Shared_File | UID: 0 | FID: 0 | CONTENT: Test.txt | 

Received: FEU: NF | Type: New_Shared_File | UID: 0 | FID: 0 | CONTENT: Test.txt 
| 

GetUpdate: FEU: NF | Type: New_Shared_File | UID: 0 | FID: 0 | CONTENT: 
Test.txt | 
Sent: FEU: MU | FID: 0 | UID: 0 | RVN: 0 | FEUID: 0 | Type: Cursor | SLOC: 6

Received: FEU: MU | FID: 0 | UID: 0 | RVN: 1 | FEUID: 0 | Type: Cursor | SLOC: 6

*** Closing shared file: 0 - Test.txt
Sent: FEU: NF | Type: Close_Shared_File | UID: 0 | FID: 0 | CONTENT: Test.txt | 

Received: FEU: NF | Type: Close_Shared_File | UID: 0 | FID: 0 | CONTENT: 
Test.txt | 

GetUpdate: FEU: NF | Type: Close_Shared_File | UID: 0 | FID: 0 | CONTENT: 
Test.txt | 
java.lang.NullPointerException
    at multitype.BackendClient$2.run(BackendClient.java:178)
    at java.lang.Thread.run(Thread.java:680)
GetUpdate: FEU: NF | Type: Server_Disconnect | UID: -1 | FID: -1 | CONTENT: 
java.lang.NullPointerException
multitype.BackendClient$2.run(BackendClient.java:178)
java.lang.Thread.run(Thread.java:680)
 | 


*** Server Output ***


Server Running.
Accepted Client
Sending: --------------------
Notification FEU:
type: Connection_Succeed
assign id: 0
---------------------
Sent client UID: 0
Client Added
Received: --------------------
Notification FEU:
type: User_Connected
user id: 0
username: Ryan
---------------------
Sending 1 users to client 0
Sending: --------------------
Notification FEU:
type: User_Connected
user id: 0
username: Ryan
---------------------
Sending: --------------------
Notification FEU:
type: User_Connected
user id: 0
username: Ryan
---------------------
Sending: --------------------
Notification FEU:
type: New_Host
---------------------
Received: --------------------
Notification FEU:
type: Request_Host
---------------------
Sending: --------------------
Notification FEU:
type: New_Host
---------------------
Received: --------------------
Notification FEU:
type: New_Shared_File
---------------------
Sending: --------------------
Notification FEU:
type: New_Shared_File
---------------------
Added a new file. FID: 0
Received: --------------------
Markup FEU:
file id: 0
user id: 0
rev: 0
type: Cursor
start loc: 6
---------------------
Taking feu: FEU: MU | FID: 0 | UID: 0 | RVN: 1 | FEUID: 0 | Type: Cursor | 
SLOC: 6

Sending: --------------------
Markup FEU:
file id: 0
user id: 0
rev: 1
type: Cursor
start loc: 6
---------------------
Received: --------------------
Notification FEU:
type: Close_Shared_File
---------------------
Removed file 0
Sending: --------------------
Notification FEU:
type: Close_Shared_File
---------------------