diff --git a/code/base/test_base.cpp b/code/base/test_base.cpp
index 3e0ec01..7196801 100644
--- a/code/base/test_base.cpp
+++ b/code/base/test_base.cpp
@@ -300,19 +300,24 @@ public:
 		size_t l = 0;
 		bool	type = true;
 		wchar_t buf[128] =L"";
-		int ret = str_to_wchar((char*)data, (wchar_t*)wstr.c_str(), &l);
-		if (ret == ERROR_INSUFFICIENT_BUFFER)
-        {
-			wstr.resize(l);
-			ret = str_to_wchar((char*)data, (wchar_t*)wstr.c_str(), &l);
-        }
-		if (ret == ERROR_INSUFFICIENT_BUFFER)
+		int ret = SCANNER_ERR_OK;
+		if (code != SANE_EVENT_IMAGE_OK)
 		{
-			type = false;
-			
-			h->test_callback(set_test_name_.c_str(), ui_helper::TEST_EVENT_RESULT, (void*)wstr.c_str(), type);
-			return -1;
+			ret = str_to_wchar((char*)data, (wchar_t*)wstr.c_str(), &l);
+			if (ret == ERROR_INSUFFICIENT_BUFFER)
+			{
+				wstr.resize(l);
+				ret = str_to_wchar((char*)data, (wchar_t*)wstr.c_str(), &l);
+			}
+			if (ret == ERROR_INSUFFICIENT_BUFFER)
+			{
+				type = false;
+
+				h->test_callback(set_test_name_.c_str(), ui_helper::TEST_EVENT_RESULT, (void*)wstr.c_str(), type);
+				return -1;
+			}
 		}
+
 		//std::string str = StringToUtf((char*)data);
 		switch (code)
 		{