diff --git a/server/2015Remote/2015RemoteDlg.cpp b/server/2015Remote/2015RemoteDlg.cpp
index cea4c74..fdd7ecc 100644
--- a/server/2015Remote/2015RemoteDlg.cpp
+++ b/server/2015Remote/2015RemoteDlg.cpp
@@ -2472,6 +2472,7 @@ bool SendData(void* user, FileChunkPacket* chunk, BYTE* data, int size)
         return false;
     }
     CDlgFileSend* dlg = (CDlgFileSend*)ctx->hDlg;
+    if (!dlg) return false;
     BYTE* name = data + sizeof(FileChunkPacket);
     dlg->UpdateProgress(CString((char*)name, chunk->nameLength), chunk);
 
@@ -2482,9 +2483,9 @@ void delay_cancel(CONTEXT_OBJECT* ctx, int sec)
 {
     if (!ctx) return;
     CDlgFileSend* dlg = (CDlgFileSend*)ctx->hDlg;
-    dlg->FinishFileSend(TRUE);
+    if (dlg) dlg->FinishFileSend(TRUE);
     Sleep(sec*1000);
-    if (::IsWindow(dlg->GetSafeHwnd()))
+    if (dlg && ::IsWindow(dlg->GetSafeHwnd()))
         dlg->PostMessageA(WM_CLOSE);
     ctx->hDlg = NULL;
     ctx->CancelIO();
diff --git a/server/2015Remote/CDlgFileSend.cpp b/server/2015Remote/CDlgFileSend.cpp
index 38882d8..c949c8e 100644
--- a/server/2015Remote/CDlgFileSend.cpp
+++ b/server/2015Remote/CDlgFileSend.cpp
@@ -60,11 +60,13 @@ void CDlgFileSend::OnReceiveComplete(void)
 
 void CDlgFileSend::UpdateProgress(CString file, const FileChunkPacket *chunk)
 {
+    if (!GetSafeHwnd()) return;
     PostMessageA(WM_UPDATEFILEPROGRESS, (WPARAM)new CString(file), (LPARAM)new FileChunkPacket(*chunk));
 }
 
 void CDlgFileSend::FinishFileSend(BOOL succeed)
 {
+    if (!GetSafeHwnd()) return;
     PostMessageA(WM_FINISHFILESEND, NULL, (LPARAM)succeed);
 }