diff --git a/src/jrd/extds/ExtDS.cpp b/src/jrd/extds/ExtDS.cpp
index 736260ea222..f6e11c58e1b 100644
--- a/src/jrd/extds/ExtDS.cpp
+++ b/src/jrd/extds/ExtDS.cpp
@@ -2235,6 +2235,12 @@ void Statement::setInParams(thread_db* tdbb, const MetaName* const* names,
 	const FB_SIZE_T excCount = in_excess ? in_excess->getCount() : 0;
 	const FB_SIZE_T sqlCount = m_sqlParamNames.getCount();
 
+	if (m_error = (!names && sqlCount))
+	{
+		// Parameter name expected
+		ERR_post(Arg::Gds(isc_eds_prm_name_expected));
+	}
+
 	// OK : count - excCount <= sqlCount <= count
 
 	// Check if all passed named parameters, not marked as excess, are present in query text