Hotfix for #214

src/operator/MetaOperator.cpp

@@ -96,7 +96,9 @@ void Aidge::MetaOperator_Op::setBackend(const std::string &name, Aidge::DeviceId
         for(auto i: mGraph->inputNodes()){
             auto op_i = std::static_pointer_cast<OperatorTensor>(i->getOperator());
             for(std::size_t in_idx=0; in_idx < op_i->nbInputs(); ++in_idx){
-                op_i->getInput(in_idx)->setBackend(name, device);
+                if (op_i->getInput(in_idx)) {
+                    op_i->getInput(in_idx)->setBackend(name, device);
+                }
             }
         }
         for(auto o: mGraph->outputNodes()){