diff --git a/code/client/tunnel/vnc/process/process_windows.go b/code/client/tunnel/vnc/process/process_windows.go
index ba584df..52a6d7a 100644
--- a/code/client/tunnel/vnc/process/process_windows.go
+++ b/code/client/tunnel/vnc/process/process_windows.go
@@ -126,9 +126,11 @@ func (p *Process) Close() {
 	}
 	if p.chImage != nil {
 		close(p.chImage)
+		p.chImage = nil
 	}
 	if p.chWrite != nil {
 		close(p.chWrite)
+		p.chWrite = nil
 	}
 	p.kill()
 }