diff --git a/win32ss/user/imm32/imm.c b/win32ss/user/imm32/imm.c
index f211a86cb87..ddacadf247b 100644
--- a/win32ss/user/imm32/imm.c
+++ b/win32ss/user/imm32/imm.c
@@ -1139,9 +1139,12 @@ ImmEnumInputContext(
     for (dwIndex = 0; dwIndex < dwCount; ++dwIndex)
     {
         hIMC = phList[dwIndex];
-        ret = (*lpfn)(hIMC, lParam);
-        if (!ret)
-            break;
+        if (hIMC && gpsi && ValidateHandle(hIMC, TYPE_INPUTCONTEXT))
+        {
+            ret = (*lpfn)(hIMC, lParam);
+            if (!ret)
+                break;
+        }
     }
 
     ImmLocalFree(phList);