diff --git a/winpr/libwinpr/rpc/ndr_correlation.c b/winpr/libwinpr/rpc/ndr_correlation.c
index 1afb31843..e12ee35d8 100644
--- a/winpr/libwinpr/rpc/ndr_correlation.c
+++ b/winpr/libwinpr/rpc/ndr_correlation.c
@@ -80,6 +80,8 @@ PFORMAT_STRING NdrpComputeCount(PMIDL_STUB_MESSAGE pStubMsg, unsigned char* pMem
 		if (pStubMsg->StackTop)
 			ptr = pStubMsg->StackTop;
 	}
+	else
+		return pFormat;
 
 	switch (correlation_operator)
 	{