diff --git a/LunaTranslator/LunaTranslator/myutils/hwnd.py b/LunaTranslator/LunaTranslator/myutils/hwnd.py
index 94aea60e..48d508ba 100644
--- a/LunaTranslator/LunaTranslator/myutils/hwnd.py
+++ b/LunaTranslator/LunaTranslator/myutils/hwnd.py
@@ -51,6 +51,8 @@ def grabwindow(app, callback=None):
         _()
     try:
         hwnd = gobject.baseobject.textsource.hwnd
+        if not hwnd:
+            raise
     except:
         hwnd = windows.GetForegroundWindow()
 
@@ -77,7 +79,6 @@ def grabwindow(app, callback=None):
         _()
 
 
-
 def getprocesslist():
 
     pids = windows.EnumProcesses()
@@ -233,5 +234,6 @@ def mouseselectwindow(callback):
 def screenshot(x1, y1, x2, y2, hwnd=None):
     bs = winsharedutils.gdi_screenshot(x1, y1, x2, y2, hwnd)
     pixmap = QPixmap()
-    pixmap.loadFromData(bs)
+    if bs:
+        pixmap.loadFromData(bs)
     return pixmap
diff --git a/LunaTranslator/LunaTranslator/winsharedutils.py b/LunaTranslator/LunaTranslator/winsharedutils.py
index 72b4b7e3..ade38d05 100644
--- a/LunaTranslator/LunaTranslator/winsharedutils.py
+++ b/LunaTranslator/LunaTranslator/winsharedutils.py
@@ -375,6 +375,8 @@ def gdi_screenshot(x1, y1, x2, y2, hwnd=None):
     rect.right = x2
     rect.bottom = y2
     bf = _gdi_screenshot(hwnd, rect, pointer(sz))
+    if not (sz.value and bf):
+        return None
     data = cast(bf, POINTER(c_char))[: sz.value]
     c_free(bf)
     return data
diff --git a/plugins/winsharedutils/screenshot.cpp b/plugins/winsharedutils/screenshot.cpp
index e5555d4b..afae32b8 100644
--- a/plugins/winsharedutils/screenshot.cpp
+++ b/plugins/winsharedutils/screenshot.cpp
@@ -158,6 +158,9 @@ BYTE *SaveBitmapToBuffer(HBITMAP hBitmap, size_t *size)
 }
 DECLARE BYTE *gdi_screenshot(HWND hwnd, RECT rect, size_t *size)
 {
+    *size = 0;
+    if (rect.bottom == rect.top || rect.left == rect.right)
+        return nullptr;
     if (!hwnd)
         hwnd = GetDesktopWindow();
     auto hdc = GetDC(hwnd);