diff --git a/reactos/subsystems/win32/win32k/objects/freetype.c b/reactos/subsystems/win32/win32k/objects/freetype.c
index 693d2c6214e..c13c31b9e05 100644
--- a/reactos/subsystems/win32/win32k/objects/freetype.c
+++ b/reactos/subsystems/win32/win32k/objects/freetype.c
@@ -3761,6 +3761,12 @@ NtGdiGetCharABCWidthsW(
         return FALSE;
     }
 
+    if (!Buffer)
+    {
+        SetLastWin32Error(ERROR_INVALID_PARAMETER);
+        return FALSE;
+    }
+
     BufferSize = Count * sizeof(ABC); // Same size!
     SafeBuff = ExAllocatePoolWithTag(PagedPool, BufferSize, TAG_GDITEXT);
     if (!fl) SafeBuffF = (LPABCFLOAT) SafeBuff;