diff --git a/libspu/core/context.h b/libspu/core/context.h
index 2cc5ce77..e174a872 100644
--- a/libspu/core/context.h
+++ b/libspu/core/context.h
@@ -208,7 +208,10 @@ Ret dynDispatch(SPUContext* sctx, const std::string& name, Args&&... args) {
   kernel->evaluate(&ectx);
 
   // 4. steal the result and return it.
-  return ectx.consumeOutput<Ret>(0);
+  if (ectx.numOutputs() > 0) {
+    return ectx.consumeOutput<Ret>(0);
+  }
+  return Ret();
 }
 
 // helper class
diff --git a/libspu/mpc/semi2k/arithmetic.cc b/libspu/mpc/semi2k/arithmetic.cc
index 653047b7..90591da6 100644
--- a/libspu/mpc/semi2k/arithmetic.cc
+++ b/libspu/mpc/semi2k/arithmetic.cc
@@ -494,6 +494,8 @@ void BeaverCacheKernel::evaluate(KernelEvalContext* ctx) const {
       beaver_cache->DisableCache(v.imag().value());
     }
   }
+  // dummy output
+  ctx->pushOutput(Value());
 }
 
 }  // namespace spu::mpc::semi2k