diff --git a/include/engine/routing_algorithms/routing_base.hpp b/include/engine/routing_algorithms/routing_base.hpp
index 92bbf1f60..358547858 100644
--- a/include/engine/routing_algorithms/routing_base.hpp
+++ b/include/engine/routing_algorithms/routing_base.hpp
@@ -324,6 +324,7 @@ template <class DataFacadeT, class Derived> class BasicRoutingInterface
                                  extractor::guidance::TurnInstruction::NO_TURN(), travel_mode,
                                  INVALID_EXIT_NR});
                 }
+                BOOST_ASSERT(unpacked_path.size() > 0);
                 unpacked_path.back().turn_instruction = turn_instruction;
                 unpacked_path.back().duration_until_turn += (ed.distance - total_weight);
 
diff --git a/src/engine/guidance/post_processing.cpp b/src/engine/guidance/post_processing.cpp
index 698cc33db..402666f9f 100644
--- a/src/engine/guidance/post_processing.cpp
+++ b/src/engine/guidance/post_processing.cpp
@@ -30,7 +30,6 @@ PathData forwardInto(PathData destination, const PathData &source)
 {
     // Merge a turn into a silent turn
     // Overwrites turn instruction and increases exit NR
-    destination.duration_until_turn += source.duration_until_turn;
     destination.exit = source.exit;
     return destination;
 }
@@ -40,7 +39,6 @@ PathData accumulateInto(PathData destination, const PathData &source)
     // Merge a turn into a silent turn
     // Overwrites turn instruction and increases exit NR
     BOOST_ASSERT(canMergeTrivially(destination, source));
-    destination.duration_until_turn += source.duration_until_turn;
     destination.exit = source.exit + 1;
     return destination;
 }