diff --git a/src/konnektor/network_planners/generators/heuristic_maximal_network_generator.py b/src/konnektor/network_planners/generators/heuristic_maximal_network_generator.py
index aff982f..0c9b03c 100644
--- a/src/konnektor/network_planners/generators/heuristic_maximal_network_generator.py
+++ b/src/konnektor/network_planners/generators/heuristic_maximal_network_generator.py
@@ -141,6 +141,7 @@ def generate_ligand_network(self, components: Iterable[Component]) -> LigandNetw
                     else:
                         try:
                             best_mapping = next(mapping_generator)
+                            break
                         except:
                             continue
                 if best_mapping is not None:
diff --git a/src/konnektor/network_planners/generators/maximal_network_generator.py b/src/konnektor/network_planners/generators/maximal_network_generator.py
index 1f59aa5..0bf9a36 100644
--- a/src/konnektor/network_planners/generators/maximal_network_generator.py
+++ b/src/konnektor/network_planners/generators/maximal_network_generator.py
@@ -128,6 +128,7 @@ def generate_ligand_network(self, components: Iterable[Component]) -> LigandNetw
                     else:
                         try:
                             best_mapping = next(mapping_generator)
+                            break
                         except:
                             print("warning")
                             continue