diff --git a/include/openpose/wrapper/wrapperAuxiliary.hpp b/include/openpose/wrapper/wrapperAuxiliary.hpp
index 3ec50335dfdce2f5cfff741ef4f0223e67b59513..a1aa3e5f26bb70538753b65a45ceb9673dc15ee9 100644
--- a/include/openpose/wrapper/wrapperAuxiliary.hpp
+++ b/include/openpose/wrapper/wrapperAuxiliary.hpp
@@ -148,7 +148,7 @@ namespace op
             const auto renderHandGpu = wrapperStructHand.enable && renderModeHand == RenderMode::Gpu;
 
             // Check no wrong/contradictory flags enabled
-            const auto userInputAndPreprocessingWsEmpty = userInputWs.empty();
+            const auto userInputAndPreprocessingWsEmpty = userInputWs.empty() && userPreProcessingWs.empty();
             const auto userOutputWsEmpty = userOutputWs.empty();
             wrapperConfigureSanityChecks(
                 wrapperStructPose, wrapperStructFace, wrapperStructHand, wrapperStructExtra, wrapperStructInput,